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|
nvme-get-feature(1)
===================
NAME
----
nvme-get-feature - Gets an NVMe feature, returns applicable results
SYNOPSIS
--------
[verse]
'nvme get-feature' <device> [--namespace-id=<nsid> | -n <nsid>]
[--feature-id=<fid> | -f <fid>] [--cdw11=<cdw11>]
[--uuid-index=<uuid-index> | -U <uuid_index>]
[--data-len=<data-len> | -l <data-len>]
[--sel=<select> | -s <select>]
[--raw-binary | -b]
[--human-readable | -H]
DESCRIPTION
-----------
Submits an NVMe Get Feature admin command and returns the applicable
results. This may be the feature's value, or may also include a feature
structure if the feature requires it (ex: LBA Range Type).
The <device> parameter is mandatory and may be either the NVMe character
device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1).
On success, the returned feature's structure (if applicable) may be
returned in one of several ways depending on the option flags; the
structure may parsed by the program and printed in a readable format
if it is a known structure, displayed in hex, or the raw buffer may be
printed to stdout for another program to parse.
OPTIONS
-------
-n <nsid>::
--namespace-id=<nsid>::
Retrieve the feature for the given nsid. This is optional and
most features do not use this value.
-f <fid>::
--feature-id=<fid>::
The feature id to send with the command. Value provided should
be in hex.
-s <select>::
--sel=<select>::
Select (SEL): This field specifies which value of the attributes
to return in the provided data:
+
[]
|==================
|Select|Description
|0|Current
|1|Default
|2|Saved
|3|Supported capabilities
|4–7|Reserved
|==================
-U <uuid-index>::
--uuid-index=<uuid-index>::
UUID Index of the feature
-l <data-len>::
--data-len=<data-len>::
The data length for the buffer returned for this feature. Most
known features do not use this value. The exception is LBA
Range Type
--cdw11=<cdw11>::
The value for command dword 11, if applicable.
-b::
--raw-binary::
Print the raw feature buffer to stdout if the feature returns
a structure.
-H::
--human-readable::
This option will parse and format many of the bit fields
into human-readable formats.
EXAMPLES
--------
* Retrieves the feature for Number of Queues, or feature id 7:
+
------------
# nvme get-feature /dev/nvme0 -f 7
------------
+
* The following retrieves the feature for the LBA Range Type, which
implicitly requires a buffer and will be printed to the screen in human
readable format:
+
------------
# nvme get-feature /dev/nvme0 -f 3
------------
+
* Retrieves the feature for the some vendor specific feature and
specifically requesting a buffer be allocate for this feature, which
will be displayed to the user in as a hex dump:
+
------------
# nvme get-feature /dev/nvme0 -f 0xc0 -l 512
------------
+
Get feature with UUID index
------------
# nvme get-feature /dev/nvme0 -f 0xc0 -l 512 -U 0x1
------------
* The following retrieves the feature for the LBA Range Type, which
implicitly requires a buffer and will be saved to a file in its raw
format:
+
------------
# nvme get-feature /dev/nvme0 -f 3 --raw-binary > lba_range.raw
------------
+
It is probably a bad idea to not redirect stdout when using this mode.
NVME
----
Part of the nvme-user suite
|
