SYNOPSIS
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]
                        [--output-format=<fmt> | -o <fmt>] [--verbose | -v]
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. 
- -o <fmt>
- --output-format=<fmt>
- 
Set the reporting format to normal, json or binary. Only one output format can be used at a time. 
- -v
- --verbose
- 
Increase the information detail in the output. 
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 512Get 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.rawIt is probably a bad idea to not redirect stdout when using this mode. 
NVME
Part of the nvme-user suite