sg_read_buffer(8) [debian man page]
SG_READ_BUFFER(8) SG3_UTILS SG_READ_BUFFER(8) NAME
sg_read_buffer - send a SCSI READ BUFFER command SYNOPSIS
sg_read_buffer [--help] [--hex] [--id=ID] [--length=LEN] [--mode=MO] [--offset=OFF] [--raw] [--verbose] [--version] DEVICE DESCRIPTION
Sends a SCSI READ BUFFER command to the DEVICE, and if there is a response either decodes it, prints it in hexadecimal or sends it in binary to stdout. If a response is received for a "descriptor" mode then, in the absence of --hex and --raw, it is decoded. Response for non-descriptor modes are output in hexadecimal unless the --raw option is given. OPTIONS
Arguments to long options are mandatory for short options as well. -h, --help output the usage message then exit. If used multiple times also prints the mode names and their acronyms. -H, --hex output the response in hexadecimal. When given twice the response is output in hex with the corresponding representation in ASCII to the right of each line. -i, --id=ID this option sets the buffer id field in the cdb. ID is a value between 0 (default) and 255 inclusive. -l, --length=LEN where LEN is the length, in bytes, that is placed in the "allocation length" field in the cdb. The default value is 4 (bytes). The device may respond with less bytes. -m, --mode=MO this option sets the mode field in the cdb. MO is a value between 0 (default) and 31 inclusive. Alternatively an abbreviation can be given. To list the available mode abbreviations use an invalid one (e.g. '--mode=xxx'). As an example, to fetch the read buffer descriptor give '--mode=desc' . -o, --offset=OFF this option sets the buffer offset field in the cdb. OFF is a value between 0 (default) and 2**24-1 . It is a byte offset. -r, --raw if a response is received then it is sent in binary to stdout. -v, --verbose increase the level of verbosity, (i.e. debug output). -V, --version print the version string and then exit. NOTES
All numbers given with options are assumed to be decimal. Alternatively numerical values can be given in hexadecimal preceded by either "0x" or "0X" (or has a trailing "h" or "H"). EXIT STATUS
The exit status of sg_read_buffer is 0 when it is successful. Otherwise see the sg3_utils(8) man page. AUTHORS
Written by Luben Tuikov and Douglas Gilbert. REPORTING BUGS
Report bugs to <dgilbert at interlog dot com>. COPYRIGHT
Copyright (C) 2006-2011 Luben Tuikov and Douglas Gilbert This software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR- POSE. SEE ALSO
sg_write_buffer(sg3_utils) sg3_utils-1.31 February 2011 SG_READ_BUFFER(8)
Check Out this Related Man Page
SG_GET_LBA_STATUS(8) SG3_UTILS SG_GET_LBA_STATUS(8) NAME
sg_get_lba_status - send 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 logical block 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), 1 (unmapped) and 2 (anchored) 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 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 on 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. -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
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 sbc3r29.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. Otherwise see the sg3_utils(8) man page. AUTHORS
Written by Douglas Gilbert. REPORTING BUGS
Report bugs to <dgilbert at interlog dot com>. COPYRIGHT
Copyright (C) 2009-2012 Douglas Gilbert This software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR- POSE. SEE ALSO
sg_write_same(8), sg_unmap(8) sg3_utils-1.35 November 2012 SG_GET_LBA_STATUS(8)