sg_get_lba_status man page on Scientific
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SG_GET_LBA_STATUS(8) SG3_UTILS SG_GET_LBA_STATUS(8)
NAME
sg_get_lba_status - send the SCSI GET LBA STATUS command
SYNOPSIS
sg_get_lba_status [--brief] [--help] [--hex] [--lba=LBA] [--maxlen=LEN]
[--raw] [--verbose] [--version] DEVICE
DESCRIPTION
Send the SCSI GET LBA STATUS command to the DEVICE and outputs the
response. This command was introduced in (draft) SBC-3 revision 20 and
devices that support thin provisioning should support this command.
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 in decimal. The provisioning status
can be in the range 0 to 15 of which only 0 (mapped) and 1 (unmapped)
are used currently. The amount of output can be reduced by the --brief
option.
OPTIONS
Arguments to long options are mandatory for short options as well.
-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>". So the descriptor LBA and
blocks are output in hex and the provisioning status in decimal.
When used twice (e.g. '-bb' or '--brief --brief') the the provi‐
sioning 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 on the range of the first returned LBA status descrip‐
tor (as it should according to SBC-3 revision 20) and warnings
are sent to stderr if it doesn't.
-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).
-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.
NOTES
For a discussion of thin provisioning see section 4.6.3 of sbcr20.pdf
at http://www.t10.org (or the corresponding section of a later draft).
EXIT STATUS
The exit status of sg_get_lba_status is 0 when it is successful. Other‐
wise see the sg3_utils(8) man page.
AUTHORS
Written by Douglas Gilbert.
REPORTING BUGS
Report bugs to <dgilbert at interlog dot com>.
COPYRIGHT
Copyright © 2009 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO war‐
ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
POSE.
SEE ALSO
sg_write_same(8), sg_unmap(8)
sg3_utils-1.28 September 2009 SG_GET_LBA_STATUS(8)
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