nvme-get-feature.1 - Online Linux Manual Page

NVME−GET−FEATURE - Online Linux Manual PageSection : 1
Updated : 02/01/2023
Source : NVMe
Note : NVMe Manual

NAMEnvme-get-feature − Gets an NVMe feature, returns applicable results

DESCRIPTIONSubmits 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 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.

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