NVME-WDC-VS-DEVIC(1)

NAME
nvme-wdc-vs-device-waf - Calculates the device write amplification factor and prints both TLC and SLC results

SYNOPSIS

nvme [<global-options>] wdc vs-device-waf <device>
                        [--namespace-id=<nsid> | -n <nsid>]

DESCRIPTION

For the NVMe device given, calculates the device TLC and SLC write amplification factor.

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

This will only work on WDC devices supporting this feature. Results for any other device are undefined.

On success it returns 0, error code otherwise.

OPTIONS

-n <nsid>, --namespace-id=<nsid>
    Sets the command’s nsid value to the given nsid. Defaults to 0xffffffff if not given. This option may not affect anything depending on the log page, which may or may not be specific to a namespace.

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.

These options can also be set as machine-wide defaults in nvme-cli.conf(5). A command-line flag always overrides the file.

EXAMPLES

    • Has the program issue WDC vs-device-waf plugin Command :

        # nvme wdc vs-device-waf /dev/nvme0

NVME

Part of the nvme-user suite.