nvme-write-zeroes(1)
====================

NAME
----
nvme-write-zeroes - Send an NVMe write zeroes command, return results

SYNOPSIS
--------
[verse]
'nvme-write-zeroes' <device> [--start-block=<slba> | -s <slba>]
			[--block-count=<nlb> | -c <nlb>]
			[--ref-tag=<reftag> | -r <reftag>]
			[--prinfo=<prinfo> | -p <prinfo>]
			[--app-tag-mask=<appmask> | -m <appmask>]
			[--app-tag=<apptag> | -a <apptag>] [--deac | -d]
			[--limited-retry | -l] [--force-unit-access | -f]
			[--namespace-id=<nsid> | -n <nsid>]
			[--storage-tag<storage-tag> | -S <storage-tag>]
			[--storage-tag-check<storage-tag-check> | -C <storage-tag-check>]
			[--dir-type=<dtype> | -T <dtype>]
			[--dir-spec=<dspec> | -D <dspec>]
			[--output-format=<fmt> | -o <fmt>] [--verbose | -v]
			[--timeout=<timeout> | -t <timeout>]

DESCRIPTION
-----------
The Write Zeroes command is used to set a range of logical blocks to 0.

OPTIONS
-------
-s <slba>::
--start-block=<slba>::
	Start block.

-c <nlb>::
--block-count=<nlb>::
	Number of logical blocks to write zeroes.

-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 format's 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.

-d::
--deac::
	Sets the DEAC bit, requesting controller deallocate the logical blocks.

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

-n <nsid>::
--namespace-id=<nsid>::
	Namespace ID use in the command.

-S <storage-tag>::
--storage-tag=<storage-tag>::
	Variable Sized Logical Block Storage Tag(LBST).

-C <storage-tag-check>::
--storage-tag-check=<storage-tag-check>::
	This bit specifies the Storage Tag field shall be checked as part of end-to-end
	data protection processing.

-T <dtype>::
--dir-type=<dtype>::
	Directive type

-D <dspec>::
--dir-spec=<dspec>::
	Directive specific

-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.

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

EXAMPLES
--------
No examples yet.

NVME
----
Part of the nvme-user suite
