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Ë $ÐUStfЋu[]ÐUS [ì) Y[ Usage: sg_read [blk_sgio=0|1] [bpt=BPT] [bs=BS] [cdbsz=6|10|12|16]
count=COUNT [dio=0|1] [dpo=0|1] [fua=0|1] if=IFILE
[mmap=0|1] [no_dfxer=0|1] [odir=0|1] [skip=SKIP]
[time=TI] [verbose=VERB] [--help] [--version]
where:
blk_sgio 0->normal IO for block devices, 1->SCSI commands via SG_IO
bpt is blocks_per_transfer (default is 128, or 64 KiB for default BS)
setting 'bpt=0' will do COUNT zero block SCSI READs
bs must match sector size if IFILE accessed via SCSI commands
(def=512)
cdbsz size of SCSI READ command (default is 10)
count total bytes read will be BS*COUNT (if no error)
(if negative, do |COUNT| zero block SCSI READs)
dio 1-> attempt direct IO on sg device, 0->indirect IO (def)
dpo 1-> set disable page out (DPO) in SCSI READs
fua 1-> set force unit access (FUA) in SCSI READs
if an sg, block or raw device, or a seekable file (not stdin)
mmap 1->perform mmaped IO on sg device, 0->indirect IO (def)
no_dxfer 1->DMA to kernel buffers only, not user space, 0->normal(def)
odir 1->open block device O_DIRECT, 0->don't (def)
skip each transfer starts at this logical address (def=0)
time 0->do nothing(def), 1->time from 1st cmd, 2->time from 2nd, ...
verbose increase level of verbosity (def: 0)
--help print this usage message then exit
--version print version number then exit
Issue SCSI READ commands, each starting from the same logical block address
Progress report, continuing ...
sg_read: for 6 byte commands, maximum number of blocks is 256
sg_read: for 6 byte commands, can't address blocks beyond %d
sg_read: for 6 byte commands, neither dpo nor fua bits supported
sg_read: for 10 byte commands, maximum number of blocks is %d
sg_read: expected cdb size of 6, 10, 12, or 16 but got %d
sg_read: bad cdb build, from_block=%lld, blocks=%d
reading (SG_IO) on sg device, error sg_read: bad argument to 'bpt'
sg_read: bad argument to 'bs'
sg_read: bad argument to 'count'
sg_read: bad argument to 'skip'
Assume default 'bs' (block size) of %d bytes
cannot select both dio and mmap
cannot select no_dxfer with dio or mmap
'-' (stdin) invalid as <filename>
sg_read: SCSI READ (6) can't do zero block reads
sg_read: could not open %s for sg reading Opened %s for SG_IO with flags=0x%x
SG_GET_RESERVED_SIZE yields: %d
sg_read: SG_SET_RESERVED_SIZE error sg_read: sg driver prior to 3.x.y
sg_read: mmap-ed IO needs a sg driver version >= 3.1.22
sg_read: mmap-ed IO only support on sg devices
sg_read: negative 'count' only supported with SCSI READs
sg_read: could not open %s for reading Opened %s for Unix reads with flags=0x%x
sg_read: couldn't skip to required position on %s Not enough user memory for aligned storage
About to issue %lld zero block SCSI READs
Reducing read to %d blocks per loop
Unit attention, try again (r)
sg_read: SCSI READ medium/hardware error
sg_read: SCSI READ unit attention
sg_read: SCSI READ aborted command
sg_read: could not reset skip position sg_read: short read: wanted/got=%d/%d bytes, stop
Time for all %s commands was %d.%06d secs Time from second %s command to end was %d.%06d secs Time from start of %s command #%d to end was %d.%06d secs Average number of %s commands per second was %.2f
>> Direct IO requested but incomplete %d times
>>> %s set to '0' but should be set to '1' for direct IO
>> Non-zero sum of residual counts=%d
remaining block count=%lld
%lld+%d records in , %s commands issued: %d
Interrupted by signal, read cdb: %02x duration=%u ms
reading, continue reading SCSI READ read blk_sgio bpt bs cdbsz count dpo fua if mmap no_dxfer odir of skip time verb --help --vers 1.18 20071226 sg_read: : %s
Unrecognized argument '%s'
'count' must be given
skip cannot be negative
bpt must be greater than 0
must provide 'if=<filename>'
- Unable to access: %s
sg_read: error from mmap() Not enough user memory
RESERVED_SIZE ioctls failed sg_read: device not ready
sg_read: SCSI READ failed
sg_read: reading, skip=%lld , %.2f MB/sec
Some error occurred, /proc/scsi/sg/allow_dio $~L ư>h㈵> ? C $tI;X
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