SYNOPSIS

nvme [<global-options>] solidigm latency-tracking-log <device>
                        [--enable | -e]
                        [--disable | -d]
                        [--read | -r]
                        [--write | -w]
                        [--type <value> | -t <value>]

DESCRIPTION

Enables, disables, or retrieves the Solidigm latency tracking log for the given NVMe device. This log provides detailed information about I/O latencies.

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

OPTIONS

-e
--enable

Enable latency tracking before retrieving the log.

-d
--disable

Disable latency tracking after retrieving the log.

-r
--read

Retrieve read latency statistics (default if neither --read nor --write is specified).

-w
--write

Retrieve write latency statistics.

-t <value>
--type <value>

Specify the log type to retrieve. Valid values depend on the device’s capabilities.

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

  • Enable latency tracking and retrieve the read latency log: 

    # nvme solidigm latency-tracking-log /dev/nvme0 --enable --read

  • Retrieve the write latency log in JSON format: 

    # nvme solidigm latency-tracking-log /dev/nvme0 --write -o json

  • Disable latency tracking after retrieving the log: 

    # nvme solidigm latency-tracking-log /dev/nvme0 --disable

  • Specify a log type when retrieving latency statistics: 

    # nvme solidigm latency-tracking-log /dev/nvme0 --type 1 --read

NVME

Part of the nvme-user suite