1139 lines
35 KiB
HTML
1139 lines
35 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
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<meta name="generator" content="AsciiDoc 8.6.9" />
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<title>nvme-wdc-smart-add-log(1)</title>
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<style type="text/css">
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/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
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/* Default font. */
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body {
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font-family: Georgia,serif;
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}
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/* Title font. */
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h1, h2, h3, h4, h5, h6,
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div.title, caption.title,
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thead, p.table.header,
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#toctitle,
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#author, #revnumber, #revdate, #revremark,
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#footer {
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font-family: Arial,Helvetica,sans-serif;
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}
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body {
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margin: 1em 5% 1em 5%;
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}
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a {
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color: blue;
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text-decoration: underline;
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}
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a:visited {
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color: fuchsia;
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}
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em {
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font-style: italic;
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color: navy;
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}
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strong {
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font-weight: bold;
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color: #083194;
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}
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h1, h2, h3, h4, h5, h6 {
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color: #527bbd;
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margin-top: 1.2em;
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margin-bottom: 0.5em;
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line-height: 1.3;
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}
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h1, h2, h3 {
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border-bottom: 2px solid silver;
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}
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h2 {
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padding-top: 0.5em;
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}
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h3 {
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float: left;
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}
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h3 + * {
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clear: left;
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}
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h5 {
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font-size: 1.0em;
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}
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div.sectionbody {
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margin-left: 0;
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}
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hr {
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border: 1px solid silver;
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}
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p {
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margin-top: 0.5em;
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margin-bottom: 0.5em;
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}
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ul, ol, li > p {
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margin-top: 0;
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}
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ul > li { color: #aaa; }
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ul > li > * { color: black; }
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.monospaced, code, pre {
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font-family: "Courier New", Courier, monospace;
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font-size: inherit;
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color: navy;
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padding: 0;
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margin: 0;
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}
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pre {
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white-space: pre-wrap;
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}
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#author {
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color: #527bbd;
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font-weight: bold;
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font-size: 1.1em;
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}
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#email {
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}
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#revnumber, #revdate, #revremark {
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}
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#footer {
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font-size: small;
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border-top: 2px solid silver;
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padding-top: 0.5em;
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margin-top: 4.0em;
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}
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#footer-text {
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float: left;
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padding-bottom: 0.5em;
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}
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#footer-badges {
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float: right;
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padding-bottom: 0.5em;
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}
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#preamble {
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margin-top: 1.5em;
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margin-bottom: 1.5em;
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}
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div.imageblock, div.exampleblock, div.verseblock,
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div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
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div.admonitionblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.admonitionblock {
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margin-top: 2.0em;
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margin-bottom: 2.0em;
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margin-right: 10%;
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color: #606060;
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}
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div.content { /* Block element content. */
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padding: 0;
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}
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/* Block element titles. */
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div.title, caption.title {
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color: #527bbd;
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font-weight: bold;
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text-align: left;
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margin-top: 1.0em;
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margin-bottom: 0.5em;
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}
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div.title + * {
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margin-top: 0;
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}
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td div.title:first-child {
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margin-top: 0.0em;
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}
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div.content div.title:first-child {
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margin-top: 0.0em;
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}
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div.content + div.title {
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margin-top: 0.0em;
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}
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div.sidebarblock > div.content {
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background: #ffffee;
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border: 1px solid #dddddd;
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border-left: 4px solid #f0f0f0;
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padding: 0.5em;
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}
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div.listingblock > div.content {
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border: 1px solid #dddddd;
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border-left: 5px solid #f0f0f0;
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background: #f8f8f8;
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padding: 0.5em;
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}
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div.quoteblock, div.verseblock {
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padding-left: 1.0em;
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margin-left: 1.0em;
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margin-right: 10%;
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border-left: 5px solid #f0f0f0;
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color: #888;
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}
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div.quoteblock > div.attribution {
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padding-top: 0.5em;
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text-align: right;
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}
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div.verseblock > pre.content {
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font-family: inherit;
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font-size: inherit;
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}
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div.verseblock > div.attribution {
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padding-top: 0.75em;
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text-align: left;
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}
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/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
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div.verseblock + div.attribution {
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text-align: left;
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}
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div.admonitionblock .icon {
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vertical-align: top;
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font-size: 1.1em;
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font-weight: bold;
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text-decoration: underline;
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color: #527bbd;
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padding-right: 0.5em;
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}
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div.admonitionblock td.content {
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padding-left: 0.5em;
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border-left: 3px solid #dddddd;
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}
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div.exampleblock > div.content {
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border-left: 3px solid #dddddd;
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padding-left: 0.5em;
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}
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div.imageblock div.content { padding-left: 0; }
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span.image img { border-style: none; vertical-align: text-bottom; }
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a.image:visited { color: white; }
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dl {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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dt {
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margin-top: 0.5em;
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margin-bottom: 0;
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font-style: normal;
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color: navy;
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}
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dd > *:first-child {
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margin-top: 0.1em;
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}
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ul, ol {
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list-style-position: outside;
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}
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ol.arabic {
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list-style-type: decimal;
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}
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ol.loweralpha {
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list-style-type: lower-alpha;
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}
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ol.upperalpha {
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list-style-type: upper-alpha;
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}
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ol.lowerroman {
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list-style-type: lower-roman;
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}
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ol.upperroman {
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list-style-type: upper-roman;
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}
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div.compact ul, div.compact ol,
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div.compact p, div.compact p,
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div.compact div, div.compact div {
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margin-top: 0.1em;
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margin-bottom: 0.1em;
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}
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tfoot {
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font-weight: bold;
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}
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td > div.verse {
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white-space: pre;
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}
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div.hdlist {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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div.hdlist tr {
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padding-bottom: 15px;
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}
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dt.hdlist1.strong, td.hdlist1.strong {
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font-weight: bold;
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}
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td.hdlist1 {
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vertical-align: top;
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font-style: normal;
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padding-right: 0.8em;
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color: navy;
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}
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td.hdlist2 {
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vertical-align: top;
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}
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div.hdlist.compact tr {
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margin: 0;
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padding-bottom: 0;
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}
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.comment {
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background: yellow;
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}
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.footnote, .footnoteref {
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font-size: 0.8em;
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}
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span.footnote, span.footnoteref {
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vertical-align: super;
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}
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#footnotes {
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margin: 20px 0 20px 0;
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padding: 7px 0 0 0;
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}
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#footnotes div.footnote {
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margin: 0 0 5px 0;
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}
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#footnotes hr {
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border: none;
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border-top: 1px solid silver;
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height: 1px;
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text-align: left;
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margin-left: 0;
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width: 20%;
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min-width: 100px;
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}
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div.colist td {
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padding-right: 0.5em;
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padding-bottom: 0.3em;
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vertical-align: top;
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}
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div.colist td img {
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margin-top: 0.3em;
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}
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@media print {
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#footer-badges { display: none; }
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}
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#toc {
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margin-bottom: 2.5em;
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}
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#toctitle {
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color: #527bbd;
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font-size: 1.1em;
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font-weight: bold;
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margin-top: 1.0em;
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margin-bottom: 0.1em;
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}
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div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
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margin-top: 0;
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margin-bottom: 0;
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}
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div.toclevel2 {
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margin-left: 2em;
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font-size: 0.9em;
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}
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div.toclevel3 {
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margin-left: 4em;
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font-size: 0.9em;
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}
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div.toclevel4 {
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margin-left: 6em;
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font-size: 0.9em;
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}
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span.aqua { color: aqua; }
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span.black { color: black; }
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span.blue { color: blue; }
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span.fuchsia { color: fuchsia; }
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span.gray { color: gray; }
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span.green { color: green; }
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span.lime { color: lime; }
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span.maroon { color: maroon; }
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span.navy { color: navy; }
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span.olive { color: olive; }
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span.purple { color: purple; }
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span.red { color: red; }
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span.silver { color: silver; }
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span.teal { color: teal; }
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span.white { color: white; }
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span.yellow { color: yellow; }
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span.aqua-background { background: aqua; }
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span.black-background { background: black; }
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span.blue-background { background: blue; }
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span.fuchsia-background { background: fuchsia; }
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span.gray-background { background: gray; }
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span.green-background { background: green; }
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span.lime-background { background: lime; }
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span.maroon-background { background: maroon; }
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span.navy-background { background: navy; }
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span.olive-background { background: olive; }
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span.purple-background { background: purple; }
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span.red-background { background: red; }
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span.silver-background { background: silver; }
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span.teal-background { background: teal; }
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span.white-background { background: white; }
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span.yellow-background { background: yellow; }
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span.big { font-size: 2em; }
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span.small { font-size: 0.6em; }
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span.underline { text-decoration: underline; }
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span.overline { text-decoration: overline; }
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span.line-through { text-decoration: line-through; }
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div.unbreakable { page-break-inside: avoid; }
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/*
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* xhtml11 specific
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*
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* */
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div.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.tableblock > table {
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border: 3px solid #527bbd;
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}
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thead, p.table.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.table {
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margin-top: 0;
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}
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/* Because the table frame attribute is overridden by CSS in most browsers. */
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div.tableblock > table[frame="void"] {
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border-style: none;
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}
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div.tableblock > table[frame="hsides"] {
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border-left-style: none;
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border-right-style: none;
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}
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div.tableblock > table[frame="vsides"] {
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border-top-style: none;
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border-bottom-style: none;
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}
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/*
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* html5 specific
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*
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* */
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table.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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thead, p.tableblock.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.tableblock {
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margin-top: 0;
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}
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table.tableblock {
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border-width: 3px;
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border-spacing: 0px;
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border-style: solid;
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border-color: #527bbd;
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border-collapse: collapse;
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}
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th.tableblock, td.tableblock {
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border-width: 1px;
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padding: 4px;
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border-style: solid;
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border-color: #527bbd;
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}
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table.tableblock.frame-topbot {
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border-left-style: hidden;
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border-right-style: hidden;
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}
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table.tableblock.frame-sides {
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border-top-style: hidden;
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border-bottom-style: hidden;
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}
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table.tableblock.frame-none {
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border-style: hidden;
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}
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th.tableblock.halign-left, td.tableblock.halign-left {
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text-align: left;
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}
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th.tableblock.halign-center, td.tableblock.halign-center {
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text-align: center;
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}
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th.tableblock.halign-right, td.tableblock.halign-right {
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text-align: right;
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}
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th.tableblock.valign-top, td.tableblock.valign-top {
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vertical-align: top;
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}
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|
th.tableblock.valign-middle, td.tableblock.valign-middle {
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vertical-align: middle;
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}
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th.tableblock.valign-bottom, td.tableblock.valign-bottom {
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vertical-align: bottom;
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}
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|
|
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/*
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* manpage specific
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*
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* */
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|
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body.manpage h1 {
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padding-top: 0.5em;
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padding-bottom: 0.5em;
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border-top: 2px solid silver;
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border-bottom: 2px solid silver;
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}
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|
body.manpage h2 {
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border-style: none;
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}
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body.manpage div.sectionbody {
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margin-left: 3em;
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}
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@media print {
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body.manpage div#toc { display: none; }
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}
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|
|
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</style>
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|
<script type="text/javascript">
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/*<+'])');
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// Function that scans the DOM tree for header elements (the DOM2
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// nodeIterator API would be a better technique but not supported by all
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// browsers).
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|
var iterate = function (el) {
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for (var i = el.firstChild; i != null; i = i.nextSibling) {
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if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
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var mo = re.exec(i.tagName);
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if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
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result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
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}
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iterate(i);
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}
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}
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}
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iterate(el);
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return result;
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}
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|
|
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var toc = document.getElementById("toc");
|
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if (!toc) {
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return;
|
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}
|
|
|
|
// Delete existing TOC entries in case we're reloading the TOC.
|
|
var tocEntriesToRemove = [];
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var i;
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for (i = 0; i < toc.childNodes.length; i++) {
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var entry = toc.childNodes[i];
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if (entry.nodeName.toLowerCase() == 'div'
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&& entry.getAttribute("class")
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&& entry.getAttribute("class").match(/^toclevel/))
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tocEntriesToRemove.push(entry);
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}
|
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for (i = 0; i < tocEntriesToRemove.length; i++) {
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toc.removeChild(tocEntriesToRemove[i]);
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}
|
|
|
|
// Rebuild TOC entries.
|
|
var entries = tocEntries(document.getElementById("content"), toclevels);
|
|
for (var i = 0; i < entries.length; ++i) {
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var entry = entries[i];
|
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if (entry.element.id == "")
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entry.element.id = "_toc_" + i;
|
|
var a = document.createElement("a");
|
|
a.href = "#" + entry.element.id;
|
|
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|
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</head>
|
|
<body class="manpage">
|
|
<div id="header">
|
|
<h1>
|
|
nvme-wdc-smart-add-log(1) Manual Page
|
|
</h1>
|
|
<h2>NAME</h2>
|
|
<div class="sectionbody">
|
|
<p>nvme-wdc-smart-add-log -
|
|
Send NVMe WDC smart-add-log Vendor Unique Command, return result
|
|
</p>
|
|
</div>
|
|
</div>
|
|
<div id="content">
|
|
<div class="sect1">
|
|
<h2 id="_synopsis">SYNOPSIS</h2>
|
|
<div class="sectionbody">
|
|
<div class="verseblock">
|
|
<pre class="content"><em>nvme wdc smart-add-log</em> <device> [--interval=<NUM>, -i <NUM>] [--output-format=<normal|json> -o <normal|json>]</pre>
|
|
<div class="attribution">
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_description">DESCRIPTION</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>For the NVMe device given, send a Vendor Unique WDC smart-add-log command and
|
|
provide the additional smart log. The --interval option will return performance
|
|
statistics from the specified reporting interval.</p></div>
|
|
<div class="paragraph"><p>The <device> parameter is mandatory and may be either the NVMe character
|
|
device (ex: /dev/nvme0).</p></div>
|
|
<div class="paragraph"><p>This will only work on WDC devices supporting this feature.
|
|
Results for any other device are undefined.</p></div>
|
|
<div class="paragraph"><p>On success it returns 0, error code otherwise.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_options">OPTIONS</h2>
|
|
<div class="sectionbody">
|
|
<div class="dlist"><dl>
|
|
<dt class="hdlist1">
|
|
-i <NUM>
|
|
</dt>
|
|
<dt class="hdlist1">
|
|
--interval=<NUM>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Return the statistics from specific interval, defaults to 14
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
-o <format>
|
|
</dt>
|
|
<dt class="hdlist1">
|
|
--output-format=<format>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Set the reporting format to <em>normal</em>, or
|
|
<em>json</em>. Only one output format can be used at a time.
|
|
Default is normal.
|
|
</p>
|
|
</dd>
|
|
</dl></div>
|
|
<div class="paragraph"><p>Valid Interval values and description :-</p></div>
|
|
<div class="tableblock">
|
|
<table rules="all"
|
|
style="margin-left:auto; margin-right:auto;"
|
|
width="100%"
|
|
frame="hsides"
|
|
cellspacing="0" cellpadding="4">
|
|
<col width="50%" />
|
|
<col width="50%" />
|
|
<thead>
|
|
<tr>
|
|
<th align="left" valign="top">Value </th>
|
|
<th align="left" valign="top">Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>1</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Most recent five (5) minute accumulated set.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>2-12</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Previous five (5) minute accumulated sets.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>13</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">The accumulated total of sets 1 through 12 that contain the previous hour of
|
|
accumulated statistics.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>14</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">The statistical set accumulated since power-up.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>15</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">The statistical set accumulated during the entire lifetime of the device.</p></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_ca_log_page_data_output_explanation">CA Log Page Data Output Explanation</h2>
|
|
<div class="sectionbody">
|
|
<div class="tableblock">
|
|
<table rules="all"
|
|
style="margin-left:auto; margin-right:auto;"
|
|
width="100%"
|
|
frame="hsides"
|
|
cellspacing="0" cellpadding="4">
|
|
<col width="50%" />
|
|
<col width="50%" />
|
|
<thead>
|
|
<tr>
|
|
<th align="left" valign="top">Field </th>
|
|
<th align="left" valign="top">Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Physical NAND bytes written.</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">The number of bytes written to NAND. 16 bytes - hi/lo</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Physical NAND bytes read</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">The number of bytes read from NAND. 16 bytes - hi/lo</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Bad NAND Block Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Raw and normalized count of the number of NAND blocks that have been
|
|
retired after the drives manufacturing tests (i.e. grown back blocks).
|
|
2 bytes normalized, 6 bytes raw count</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Uncorrectable Read Error Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Total count of NAND reads that were not correctable by read retries, all
|
|
levels of ECC, or XOR (as applicable). 8 bytes</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Soft ECC Error Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Total count of NAND reads that were not correctable by read retries, or
|
|
first-level ECC. 8 bytes</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>SSD End to End Detection Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">A count of the detected errors by the SSD end to end error correction which
|
|
includes DRAM, SRAM, or other storage element ECC/CRC protection mechanism (not
|
|
NAND ECC). 4 bytes</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>SSD End to End Correction Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">A count of the corrected errors by the SSD end to end error correction which
|
|
includes DRAM, SRAM, or other storage element ECC/CRC protection mechanism (not
|
|
NAND ECC). 4 bytes</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>System Data % Used</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">A normalized cumulative count of the number of erase cycles per block since
|
|
leaving the factory for the system (FW and metadata) area. Starts at 0 and
|
|
increments. 100 indicates that the estimated endurance has been consumed.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>User Data Max Erase Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">The maximum erase count across all NAND blocks in the drive. 4 bytes</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>User Data Min Erase Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">The minimum erase count across all NAND blocks in the drive. 4 bytes</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Refresh Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">A count of the number of blocks that have been re-allocated due to
|
|
background operations only. 8 bytes</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Program Fail Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Raw and normalized count of total program failures. Normalized count
|
|
starts at 100 and shows the percent of remaining allowable failures.
|
|
2 bytes normalized, 6 bytes raw count</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>User Data Erase Fail Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Raw and normalized count of total erase failures in the user area.
|
|
Normalized count starts at 100 and shows the percent of remaining
|
|
allowable failures. 2 bytes normalized, 6 bytes raw count</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>System Area Erase Fail Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Raw and normalized count of total erase failures in the system area.
|
|
Normalized count starts at 100 and shows the percent of remaining
|
|
allowable failures. 2 bytes normalized, 6 bytes raw count</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Thermal Throttling Status</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">The current status of thermal throttling (enabled or disabled).
|
|
2 bytes</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Thermal Throttling Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">A count of the number of thermal throttling events. 2 bytes</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>PCIe Correctable Error Count</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Summation counter of all PCIe correctable errors (Bad TLP, Bad
|
|
DLLP, Receiver error, Replay timeouts, Replay rollovers). 8 bytes</p></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_c1_log_page_data_output_explanation">C1 Log Page Data Output Explanation</h2>
|
|
<div class="sectionbody">
|
|
<div class="tableblock">
|
|
<table rules="all"
|
|
style="margin-left:auto; margin-right:auto;"
|
|
width="100%"
|
|
frame="hsides"
|
|
cellspacing="0" cellpadding="4">
|
|
<col width="50%" />
|
|
<col width="50%" />
|
|
<thead>
|
|
<tr>
|
|
<th align="left" valign="top">Field </th>
|
|
<th align="left" valign="top">Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Read Commands</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of host read commands received during the reporting period.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Read Blocks</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of 512-byte blocks requested during the reporting period.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Average Read Size</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Average Read size is calculated using (Host Read Blocks/Host Read Commands).</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Read Cache Hit Commands</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of host read commands that serviced entirely from the on-board read
|
|
cache during the reporting period. No access to the NAND flash memory was required.
|
|
This count is only updated if the entire command was serviced from the cache memory.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Read Cache Hit Percentage</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Percentage of host read commands satisfied from the cache.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Read Cache Hit Blocks</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of 512-byte blocks of data that have been returned for Host Read Cache Hit
|
|
Commands during the reporting period. This count is only updated with the blocks
|
|
returned for host read commands that were serviced entirely from cache memory.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Average Read Cache Hit Size</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Average size of read commands satisfied from the cache.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Read Commands Stalled</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of host read commands that were stalled due to a lack of resources within
|
|
the SSD during the reporting period (NAND flash command queue full, low cache page count,
|
|
cache page contention, etc.). Commands are not considered stalled if the only reason for
|
|
the delay was waiting for the data to be physically read from the NAND flash. It is normal
|
|
to expect this count to equal zero on heavily utilized systems.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Read Commands Stalled Percentage</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Percentage of read commands that were stalled. If the figure is consistently high,
|
|
then consideration should be given to spreading the data across multiple SSDs.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Write Commands</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of host write commands received during the reporting period.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Write Blocks</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of 512-byte blocks written during the reporting period.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Average Write Size</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Average Write size calculated using (Host Write Blocks/Host Write Commands).</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Write Odd Start Commands</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of host write commands that started on a non-aligned boundary during
|
|
the reporting period. The size of the boundary alignment is normally 4K; therefore
|
|
this returns the number of commands that started on a non-4K aligned boundary.
|
|
The SSD requires slightly more time to process non-aligned write commands than it
|
|
does to process aligned write commands.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Write Odd Start Commands Percentage</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Percentage of host write commands that started on a non-aligned boundary. If this
|
|
figure is equal to or near 100%, and the NAND Read Before Write value is also high,
|
|
then the user should investigate the possibility of offsetting the file system. For
|
|
Microsoft Windows systems, the user can use Diskpart. For Unix-based operating systems,
|
|
there is normally a method whereby file system partitions can be placed where required.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Write Odd End Commands</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of host write commands that ended on a non-aligned boundary during the
|
|
reporting period. The size of the boundary alignment is normally 4K; therefore this
|
|
returns the number of commands that ended on a non-4K aligned boundary.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Write Odd End Commands Percentage</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Percentage of host write commands that ended on a non-aligned boundary.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Write Commands Stalled</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of host write commands that were stalled due to a lack of resources within the
|
|
SSD during the reporting period. The most likely cause is that the write data was being
|
|
received faster than it could be saved to the NAND flash memory. If there was a large
|
|
volume of read commands being processed simultaneously, then other causes might include
|
|
the NAND flash command queue being full, low cache page count, or cache page contention, etc.
|
|
It is normal to expect this count to be non-zero on heavily utilized systems.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Host Write Commands Stalled Percentage</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Percentage of write commands that were stalled. If the figure is consistently high, then
|
|
consideration should be given to spreading the data across multiple SSDs.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>NAND Read Commands</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of read commands issued to the NAND devices during the reporting period.
|
|
This figure will normally be much higher than the host read commands figure, as the data
|
|
needed to satisfy a single host read command may be spread across several NAND flash devices.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>NAND Read Blocks</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of 512-byte blocks requested from NAND flash devices during the reporting period.
|
|
This figure would normally be about the same as the host read blocks figure</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Average NAND Read Size</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Average size of NAND read commands.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>NAND Write Commands</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of write commands issued to the NAND devices during the reporting period.
|
|
There is no real correlation between the number of host write commands issued and the
|
|
number of NAND Write Commands.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>NAND Write Blocks</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Number of 512-byte blocks written to the NAND flash devices during the reporting period.
|
|
This figure would normally be about the same as the host write blocks figure.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>Average NAND Write Size</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">Average size of NAND write commands. This figure should never be greater than 128K, as
|
|
this is the maximum size write that is ever issued to a NAND device.</p></td>
|
|
</tr>
|
|
<tr>
|
|
<td align="left" valign="top"><p class="table"><strong>NAND Read Before Write</strong></p></td>
|
|
<td align="left" valign="top"><p class="table">This is the number of read before write operations that were required to process
|
|
non-aligned host write commands during the reporting period. See Host Write Odd Start
|
|
Commands and Host Write Odd End Commands. NAND Read Before Write operations have
|
|
a detrimental effect on the overall performance of the device.</p></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_examples">EXAMPLES</h2>
|
|
<div class="sectionbody">
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
Has the program issue WDC smart-add-log Vendor Unique Command with default interval (14) :
|
|
</p>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre><code># nvme wdc smart-add-log /dev/nvme0</code></pre>
|
|
</div></div>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_nvme">NVME</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>Part of the nvme-user suite.</p></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="footnotes"><hr /></div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated
|
|
2018-01-17 20:47:00 KST
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</div>
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</div>
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</body>
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