sg_get_lba_status - send SCSI GET LBA STATUS(16 or 32) command
sg_get_lba_status [--16] [--32]
[--brief] [--element-id=EI] [--help] [--hex]
[--lba=LBA] [--maxlen=LEN] [--raw] [--readonly]
[--report-type=RT] [--scan-len=SL] [--verbose]
[--version] DEVICE
Send the SCSI GET LBA STATUS(16) or GET LBA STATUS(32) command to
the DEVICE and output the response. The 16 byte command variant was
introduced in (draft) SBC-3 revision 20 and devices that support logical
block provisioning should support this command. The GET LBA STATUS(32)
command was added in (draft) SBC-4 revision 14.
The default action is to decode the response into one LBA status
descriptor per line output to stdout. The descriptor LBA is output in hex
(prefixed by '0x') and the number of blocks is output in decimal followed by
the provisioning status and additional status in decimal. The provisioning
status can be in the range 0 to 15 of which only 0 (mapped or unknown), 1
(unmapped), 2 (anchored), 3 (mapped) and 4 (unknown) are used currently. The
amount of output can be reduced by the --brief option.
Arguments to long options are mandatory for short options as
well.
- -S, --16
- send SCSI GET LBA STATUS(16) command which is the 16 byte variant. In the
absence of the --16 or the --32 options the SCSI GET LBA
STATUS(16) command is sent. If both --16 and the --32
options are given then the GET LBA STATUS(16) command is sent.
- -T, --32
- send SCSI GET LBA STATUS(32) command which is the 32 byte variant. When
given together with the --16 option then this option is ignored (so
the GET LBA STATUS(16) command is sent).
- -b, --brief
- when use once then one LBA status descriptor per line is output to stdout.
Each line has this format: "0x<descriptor_LBA> 0x<blocks>
<provisioning_status> <additional_status>". So the
descriptor's starting LBA and number of blocks are output in hex while the
provisioning status and additional status are in decimal. When used twice
(e.g. '-bb' or '--brief --brief') then the provisioning status of the
given LBA (or LBA 0 if the --lba option is not given) is
output to stdout. A check is made that the given LBA lies in the
range of the first returned LBA status descriptor (as it should according
to SBC-3 revision 20) and warnings are sent to stderr if it doesn't.
- -e,
--element-id=EI
- where EI is the element identifier of the physical element for
which the LBAs shall be reported based on the value in the report type
field (i.e. RT). This option is only active with the SCSI GET LBA
STATUS(32) command (i.e. it is ignored if the GET LBA STATUS(16) command
is sent).
Valid element identifiers are non-zero. The default value of EI is 0
which means in the context that no element identifier is specified.
- -h, --help
- output the usage message then exit.
- -H, --hex
- output response to this command in ASCII hex.
- -l,
--lba=LBA
- where LBA is the starting Logical Block Address (LBA) to check the
provisioning status for. Note that the DEVICE chooses how many
following blocks that it will return provisioning status for.
- -m,
--maxlen=LEN
- where LEN is the (maximum) response length in bytes. It is placed
in the cdb's "allocation length" field. If not given then 24 is
used. 24 is enough space for the response header and one LBA status
descriptor. LEN should be 8 plus a multiple of 16 (e.g. 24, 40, and
56 are suitable).
- -r, --raw
- output response in binary (to stdout).
- -R,
--readonly
- open the DEVICE read-only (e.g. in Unix with the O_RDONLY flag).
The default is to open it read-write.
- -t,
--report-type=RT
- where RT is 0 for report all LBAs; 1 for report LBAs using non-zero
provisioning status; 2 for report LBAs that are mapped; 3 for report LBAs
that are de-allocated; 4 for report LBAs that are anchored; 16 for report
LBAs that may return an unrecovered error. The REPORT TYPE field was added
to the GET LBA STATUS cdb in sbc4r12.
Since the REPORT TYPE field is newer than the command, the response contains
the RTP bit to indicate whether or not the DEVICE acts on the
REPORT TYE field (set when it does act on it, clear otherwise).
- -s,
--scan-len=SL
- where SL is the scan length which is the maximum number of
contiguous logical blocks to be scanned for logical blocks that meet the
given report type (i.e. RT). This option is only active with the
SCSI GET LBA STATUS(32) command (i.e. it is ignored if the GET LBA
STATUS(16) command is sent).
The default value of SL is 0 which should be interpreted by the
DEVICE as there is no limits to the number of LBAs that shall be
scanned.
- -v, --verbose
- increase the level of verbosity, (i.e. debug output). Additional output
caused by this option is sent to stderr.
- -V, --version
- print the version string and then exit.
In SBC-3 revision 25 the calculation associated with the Parameter
Data Length field in the response was modified. Prior to that the byte
offset was 8 and in revision 25 it was changed to 4.
For a discussion of logical block provisioning see section 4.7 of
sbc4r14.pdf at http://www.t10.org (or the corresponding section of a later
draft).
The exit status of sg_get_lba_status is 0 when it is successful.
Otherwise see the sg3_utils(8) man page.
Written by Douglas Gilbert.
Report bugs to <dgilbert at interlog dot com>.
Copyright © 2009-2018 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO warranty;
not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.