NVME-FEAT-VOLATILE(1)

💅 nvme-feat-volatile-wc — from the NVMe Manual ✨

okay bestie, this is the page for nvme-feat-volatile-wc, straight out of the NVMe Manual, and it's literally all about getting and setting the volatile write cache feature. yes, that's the whole vibe. let's go 🫶

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✨ NAME ✨

nvme-feat-volatile-wc — get and set volatile write cache feature 💖

🦋 SYNOPSIS 🦋

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

🌸 DESCRIPTION 🌸

Get and set volatile write cache feature. that's it, that's the job, and she does it flawlessly 💅

the <device> parameter is mandatory — no vibes-only invocations, she needs an actual device. and it can be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1). pick your fighter 🎀

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 — so with no --wce you're just peeking, not touching 👀

on success it returns 0, error code otherwise. so like, 0 = slay, anything else = check yourself 😭

👑 OPTIONS 👑

• -w, --wce — Write Cache Enable. if specified, enables the volatile write cache ✨ if omitted when updating, disables the volatile write cache. so the flag is the on-switch, and its absence is the off-switch, no cap.
• -S <select>, --sel=<select> — Select (SEL): this field specifies which value of the attributes to return in the provided data 🧚 here's the whole menu, bestie:
  • 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. yes, she'll remember even after the lights go out 💀 permanent main character energy.

🌈 GLOBAL OPTIONS 🌈

these are defined at the top-level nvme command and are available to this subcommand — so they're like, the group chat everyone's in 🫶

• --dry-run — print the command that would be executed, but do not actually execute it. all talk, no action, on purpose.
• --no-ioctl-probing — disable probing for 64-bit IOCTL support.
• --no-retries — disable retry logic on transient errors. one shot, one opportunity.
• -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 — pick one, don't be greedy 😌
• --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. other versions are rejected — do not try it, she will not budge 🙈
• --quiet — suppress informational messages. errors are still reported, and --quiet cancels any --verbose for the library log level. so it literally overrides the yapping.
• --set-options=<key=value>[,<key=value>...] — set libnvme library options for this invocation. supported keys are force-4k, mi-probe-enabled, test-base-dir and test-sysfs-dir. list them out, she handles it ✨
• --timeout=<ms> — set the timeout for the command in milliseconds. infinite or -1 waits without a time limit (0xffffffff). patience is a virtue, and also a hex value 💜
• -v, --verbose — increase the level of detail in the output. may be specified multiple times to further increase verbosity. stack it like your fave serum 🧴

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

🍓 EXAMPLES 🍓

• has the program issue a feat volatile-wc to get the current configuration — the little look-but-don't-touch moment 🎀

# nvme feat volatile-wc /dev/nvme0

• has the program issue a feat volatile-wc to enable the volatile write cache — turning it on and making it stick 🔥

# nvme feat volatile-wc /dev/nvme0 --wce --save

⭐ NVME ⭐

part of the nvme-user suite. iconic, honestly.

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and that's the whole page, bestie — NVMe, dated 10/30/2026, of the NVME-FEAT-VOLATILE(1) manual. go forth and cache responsibly 💖🦋✨