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SG_GET_LBA_STATUS

Section: SG3_UTILS (8)
Updated: June 2023
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NAME

sg_get_lba_status - send SCSI GET LBA STATUS(16 or 32) command

SYNOPSIS

sg_get_lba_status [--16] [--32] [--blockhex] [--brief] [--element-id=EI] [--help] [--hex] [--inhex=FN] [--json[=JO]] [--lba=LBA] [--maxlen=LEN] [--raw] [--readonly] [--report-type=RT] [--scan-len=SL] [--verbose] [--version] DEVICE

DESCRIPTION

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 then output a header and the status descriptors 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, LBA accessibility 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.

Rather than send this SCSI command to DEVICE, if the --inhex=FN option is given, then the contents of the file named FN are decoded as ASCII hex and then processed if it was the response of this command.

OPTIONS

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.
-B, --blockhex: the number of blocks in each LBA status descriptor is usually displayed in decimal. An exception is when the --brief option is given in which case it is shown in hexadecimal. When the option is given once, both cases are output in hexadecimal. When the option is given twice, both cases are output in decimal.
-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. To produce hex output suitable for a later invocation to fetch with the --inhex=FN option, use this option three times. The short form option makes this more convenient: '-HHH'.
-i, --inhex=FN: where FN is a filename whose contents are assumed to be ASCII hexadecimal bytes. See the "HEX, BINARY AND JSON FORMATS" section in the sg3_utils manpage for more information. If DEVICE is also given then it is ignored. If the --raw option is also given then the contents of FN are treated as binary.
-j[=JO], --json[=JO]: output is in JSON format instead of plain text form. Note that arguments to the short and long form are themselves optional and if present start with "=" and no whitespace is permitted around that "=".
See sg3_utils_json manpage or use '?' for JO to get a summary.
-J, --js-file=JFN: output is in JSON format and it is sent to a file named JFN. If that file exists then it is truncated. By default, the JSON output is sent to stdout.
When this option is given, the --json[=JO] option is implied and need not be given. The --json[=JO] option may still be needed to set the JO parameter to non-default values.
-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) unless the --inhex=FN option is also given. In that case the input file name (FN) is decoded as binary (and the output is _not_ in binary).
-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 TYPE 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.

NOTES

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 https://www.t10.org (or the corresponding section of a later draft).

EXAMPLES

This example uses a "canned" hex file rather than a real DEVICE.

# cd <folder at root of sg3_utils source package>
# sg_get_lba_status --inhex=inhex/get_lba_status.hex

  Command completed due to meeting capacity of medium
  RTP=0x0
  [1] LBA: 0x0             blocks:  287453952  mapped (or unknown);  LBA accessibility not reported
  [2] LBA: 0x11223300      blocks:         68  deallocated;  LBA access not reported  [may contain unrecovered errors]
  [3] LBA: 0x11223344      blocks:         51  deallocated;  LBA extent inaccessible  [may contain unrecovered errors]

EXIT STATUS

The exit status of sg_get_lba_status is 0 when it is successful. Otherwise see the sg3_utils(8) man page.

AUTHORS

Written by Douglas Gilbert.

REPORTING BUGS

Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

This document was created by man2html, using the manual pages.
Time: 04:00:44 GMT, August 02, 2023