NVME-LOG-EFFECTS(1) NVMe Manual NVME-LOG-EFFECTS(1)

nvme-log-effects - Send NVMe Command Effects log page request, returns result and log

nvme [<global-options>] log effects <device> [--raw-binary | -b]

Retrieves the NVMe Command Effects log page from an NVMe device and provides the returned structure.

The <device> parameter is mandatory and should be the NVMe character device (ex: /dev/nvme0).

On success, the returned command effects log structure will be printed for each command that is supported.

-b, --raw-binary

This option will print the raw buffer to stdout. Structure is not parsed by program. This overrides the verbose option.

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.

•Print the effects log page in a human readable format: 
# nvme log effects /dev/nvme0
•Have the program return the raw structure in binary: 
# nvme log effects /dev/nvme0 --raw-binary > effects_log.raw
# nvme log effects /dev/nvme0 -b > effects_log.raw

Part of the nvme-user suite

09/07/2026 NVMe