NVME-FEAT-VOLATILE(1) NVMe Manual NVME-FEAT-VOLATILE(1)

nvme-feat-volatile-wc - Get and set volatile write cache feature

nvme [<global-options>] feat volatile-wc <device>
                        [--wce | -w]
                        [--sel=<select> | -S <select>] [--save | -s]

Get and set volatile write cache feature.

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

If the setting option (--wce) is specified, the command will update the volatile write cache configuration. If the option is omitted, it will retrieve and display the current configuration.

On success it returns 0, error code otherwise.

-w, --wce

Write Cache Enable. If specified, enables the volatile write cache. If omitted when updating, disables the volatile write cache.

-S <select>, --sel=<select>

Select (SEL): This field specifies which value of the attributes to return in the provided data:

-s, --save

Save the attribute so that it persists through all power states and resets.

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.

•Has the program issue a feat volatile-wc to get the current configuration: 
# nvme feat volatile-wc /dev/nvme0
•Has the program issue a feat volatile-wc to enable the volatile write cache: 
# nvme feat volatile-wc /dev/nvme0 --wce --save

Part of the nvme-user suite.

09/07/2026 NVMe