SYNOPSIS

nvme [<global-options>] predictable-lat-log <device>
                        [--nvmset-id=<nvmset_id> | -i <nvmset_id>]
                        [--raw-binary | -b]

DESCRIPTION

Retrieves the NVMe Predictable latency per NVM set log page from an NVMe device and provides the returned structure.

The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1).

On success, the returned Predictable latency per NVM set log structure may be returned in one of several 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.

OPTIONS

-i <nvmset_id>
--nvmset-id=<nvmset_id>

Retrieve the Predictable latency per NVM set log for the given nvmset id. This argument is mandatory and its success may depend on the device’s 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.

-b
--raw-binary

Print the raw Predictable latency per NVM set log buffer to stdout.

GLOBAL OPTIONS

The following options are defined at the top-level nvme command and are available to this subcommand:

--dry-run

Print the command that would be executed, but do not actually execute it.

--no-ioctl-probing

Disable probing for 64-bit IOCTL support.

--no-retries

Disable retry logic on transient errors.

-o <fmt>
--output-format=<fmt>

Set the reporting format to normal, tabular, 'json, or binary. Only one output format may be used at a time.

--output-format-version=<version>

Select the output format version. Version 1 uses the original field naming, while version 2 (default) provides more consistent and script-friendly field names.

--timeout=<ms>

Set the timeout for the command in milliseconds.

-v
--verbose

Increase the level of detail in the output. May be specified multiple times to further increase verbosity.

EXAMPLES

  • Print the Predictable latency per NVM set log page in a human readable format: 

    # nvme predictable-lat-log /dev/nvme0

  • Print the raw Predictable latency per NVM set log to a file: 

    # nvme predictable-lat-log /dev/nvme0 --raw-binary > nvmset_log.raw

    It is probably a bad idea to not redirect stdout when using this mode.

NVME

Part of the nvme-user suite