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|
nvme-read(1)
============
NAME
----
nvme-read - Send an NVMe Read command, provide results
SYNOPSIS
--------
[verse]
'nvme-read' <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 Read command reads the logical blocks specified by the command from
the medium and copies to the data data buffer provided. Will use stdout
by default if you don't 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 kernel's 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 to STDOUT.
-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 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.
-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 controller's 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
|
