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

# [NAME](#NAME)

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

# [SYNOPSIS](#SYNOPSIS)

```
nvme [<global-options>] feat volatile-wc <device>


                        [--wce | -w]


                        [--sel=<select> | -S <select>] [--save | -s]
```

# [DESCRIPTION](#DESCRIPTION)

Get and set volatile write cache feature.

The &lt;device&gt; 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.

# [OPTIONS](#OPTIONS)

-w, --wce

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

-S &lt;select&gt;, --sel=&lt;select&gt;

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

Select Name Description 0 current Current 1 default Default 2 saved Saved 3 supported Supported capabilities

-s, --save

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

# [GLOBAL OPTIONS](#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 &lt;fmt&gt;, --output-format=&lt;fmt&gt;

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

--output-format-version=&lt;version&gt;

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

--quiet

Suppress informational messages. Errors are still reported, and --quiet cancels any --verbose for the library log level.

--set-options=&lt;key=value&gt;\[,&lt;key=value&gt;...]

Set libnvme library options for this invocation. Supported keys are *force-4k*, *mi-probe-enabled*, *test-base-dir* and *test-sysfs-dir*.

--timeout=&lt;ms&gt;

Set the timeout for the command in milliseconds. *infinite* or *-1* waits without a time limit (0xffffffff).

-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)](/man/os/nvme-cli/nvme-cli.conf.5). A command-line flag always overrides the file.

# [EXAMPLES](#EXAMPLES)

•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
```

# [NVME](#NVME)

Part of the nvme-user suite.

10/30/2026 NVMe

---

Document: nvme-feat-volatile-wc(1) from nvme-cli 3.2-r0 (Chainguard OS)
Source: https://github.com/linux-nvme/nvme-cli