nvme-get-feature(1)

NAME

   nvme-get-feature - Gets an NVMe feature, returns applicable results

SYNOPSIS

   nvme get-feature <device> [--namespace-id=<nsid> | -n <nsid>]
                             [--feature-id=<fid> | -f <fid>] [--cdw11=<cdw11>]
                             [--data-len=<data-len> | -l <data-len>]
                             [--sel=<select> | -s <select>]
                             [--raw-binary | -b]

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               
       

   -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. Only known feature
       using this is the interrupt vector configuration feature.

   -b, --raw-binary
       Print the raw feature buffer to stdout if the feature returns a
       structure.

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

   *   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

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