nvme-write

NVME-WRITE(1) NVMe Manual NVME-WRITE(1)

NAME

   nvme-write - Send an NVMe write command, provide results

SYNOPSIS

   nvme-write <device> [--start-block=<slba> | -s <slba>]
                           [--block-count=<nlb> | -c <nlb>]
                           [--data-size=<size> | -z <size>]
                           [--metadata-size=<size> | -y <size>]
                           [--ref-tag=<reftag> | -r <reftag>]
                           [--data=<data-file> | -d <data-file>]
                           [--metadata=<metadata-file> | -M <metadata-file>]
                           [--prinfo=<prinfo> | -p <prinfo>]
                           [--app-tag-mask=<appmask> | -m <appmask>]
                           [--app-tag=<apptag> | -a <apptag>]
                           [--limited-retry | -l] [--force-unit-access | -f]
                           [--dir-type=<type> | -T <type>]
                           [--dir-spec=<spec> | -S <spec>] [--dsm=<dsm> | -D <dsm>]
                           [--show-command | -V] [--dry-run | -w] [--latency | -t]
                           [--storage-tag<storage-tag> | -g <storage-tag>]
                           [--storage-tag-check | -C] [--force]
                           [--output-format=<fmt> | -o <fmt>] [--verbose | -v]
                           [--timeout=<timeout>]

DESCRIPTION

   The Write command writes the logical blocks specified by the command to the medium from the data data buffer provided. Will use stdin by default if you dont provide a file.

OPTIONS

   -s <slba>, --start-block=<slba>
       Start block.

   -c, --block-count
       The number of blocks to transfer. This is a zeroes based value to align with the kernels use of this field. (ie. 0 means transfer 1 block).

   -z <size>, --data-size=<size>
       Size of data, in bytes.

   -y <size>, --metadata-size=<size>
       Size of metadata in bytes.

   -d <data-file>, --data=<data-file>
       Data file. If none provided, contents are sent from STDIN.

   -M <metadata-file>, --metadata=<metadata-file>
       Metadata file, if necessary.

   -p <prinfo>, --prinfo=<prinfo>
       Protection Information field definition.
       
        Bit  Description                                                
       
        3    PRACT: Protection Information Action. When set to 1, PI is 
             stripped/inserted on read/write when the block formats    
             metadata size is 8. When set to 0, metadata is passes.     
       
        2:0  PRCHK: Protection Information Check:                       
       
        2    Set to 1 enables checking the guard tag                    
       
        1    Set to 1 enables checking the application tag              
       
        0    Set to 1 enables checking the reference tag                
       

   -r <reftag>, --ref-tag=<reftag>
       Optional reftag when used with protection information.

   -m <appmask>, --app-tag-mask=<appmask>
       Optional application tag mask when used with protection information.

   -a <apptag>, --app-tag=<apptag>
       Optional application tag when used with protection information.

   -l, --limited-retry
       Sets the limited retry flag.

   -f, --force-unit-access
       Set the force-unit access flag.

   -T <type>, --dir-type=<type>
       Optional directive type. The nvme-cli only enforces the value be in the defined range for the directive type, though the NVMe specification (1.3a) defines only one directive, 01h,
       for write stream identifiers.

   -S <spec>, --dir-spec=<spec>
       Optional field for directive specifics. When used with write streams, this value is defined to be the write stream identifier. The nvme-cli will not validate the stream requested
       is within the controllers capabilities.

   -D <dsm>, --dsm=<dsm>
       The optional data set management attributes for this command. The argument for this is the least significant 8 bits of the DSM field in a write command; the most significant 16
       bits of the field come from the directive specific field, if used. This may be used to set attributes for the LBAs being written, like access frequency, type, latency, among other
       things, as well as yet to be defined types. Please consult the NVMe specification for detailed breakdown of how to use this field.

   -V, --show-cmd
       Print out the command to be sent.

   -w, --dry-run
       Do not actually send the command. If want to use --dry-run option, --show-cmd option must be set. Otherwise --dry-run option will be ignored.

   -t, --latency
       Print out the latency the IOCTL took (in us).

   -g <storage-tag>, --storage-tag=<storage-tag>
       Variable Sized Expected Logical Block Storage Tag(ELBST).

   -C, --storage-tag-check
       This flag enables Storage Tag field checking as part of end-to-end data protection processing.

   --force
       Ignore namespace is currently busy and performed the operation even though.

   -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.

   --timeout=<timeout>
       Override default timeout value. In milliseconds.

EXAMPLES

   No examples yet.

NVME

   Part of the nvme-user suite

NVMe 05/02/2025 NVME-WRITE(1)