nvme-cli/Documentation/nvme-predictable-lat-log.1

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.\"     Title: nvme-predictable-lat-log
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 04/08/2022
.\"    Manual: NVMe Manual
.\"    Source: NVMe
.\"  Language: English
.\"
.TH "NVME\-PREDICTABLE\-L" "1" "04/08/2022" "NVMe" "NVMe Manual"
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.SH "NAME"
nvme-predictable-lat-log \- Send Predectible latency per NVM set log page request, returns result and log
.SH "SYNOPSIS"
.sp
.nf
\fInvme predictable\-lat\-log\fR <device> [\-\-nvmset\-id=<nvmset_id> | \-i <nvmset_id>]
                        [\-\-raw\-binary | \-b]
                        [\-\-output\-format=<fmt> | \-o <fmt>]
.fi
.SH "DESCRIPTION"
.sp
Retrieves the NVMe Predectible latency per NVM set log page from an NVMe device and provides the returned structure\&.
.sp
The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1)\&.
.sp
On success, the returned Predectible latency per NVM set log structure may be returned in one ofseveral ways depending on the option flags; the structure may parsed by the program and printed in a readable format or the raw buffer may be printed to stdout for another program to parse\&.
.SH "OPTIONS"
.PP
\-i <nvmset_id>, \-\-nvmset\-id=<nvmset_id>
.RS 4
Retrieve the Predectible latency per NVM set log for the given nvmset id\&. This argument is mandatory and its success may depend on the device\(cqs statistics to provide this log For More details see NVM Express 1\&.4 Spec\&. Section 5\&.14\&.1\&.10\&. The default nvmset id to use is 1 for the device\&.
.RE
.PP
\-b, \-\-raw\-binary
.RS 4
Print the raw Predectible latency per NVM set log buffer to stdout\&.
.RE
.PP
\-o <format>, \-\-output\-format=<format>
.RS 4
Set the reporting format to
\fInormal\fR,
\fIjson\fR, or
\fIbinary\fR\&. Only one output format can be used at a time\&.
.RE
.SH "EXAMPLES"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Print the Predectible latency per NVM set log page in a human readable format:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme predictable\-lat\-log /dev/nvme0
.fi
.if n \{\
.RE
.\}
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Print the raw Predectible latency per NVM set log to a file:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme predictable\-lat\-log /dev/nvme0 \-\-raw\-binary > nvmset_log\&.raw
.fi
.if n \{\
.RE
.\}
.sp
It is probably a bad idea to not redirect stdout when using this mode\&.
.RE
.SH "NVME"
.sp
Part of the nvme\-user suite