sg_sync - send SCSI SYNCHRONIZE CACHE command
sg_sync [--16] [--count=COUNT] [--group=GN] [--help] [--immed] [--lba=LBA] [--sync-nv] [--timeout=SECS] [--verbose] [--version] DEVICE
SG_SYNC(8) SG3_UTILS SG_SYNC(8)
NAME
sg_sync - send SCSI SYNCHRONIZE CACHE command
SYNOPSIS
sg_sync [--16] [--count=COUNT] [--group=GN] [--help] [--immed]
[--lba=LBA] [--sync-nv] [--timeout=SECS] [--verbose] [--version] DEVICE
DESCRIPTION
Send SYNCHRONIZE CACHE(10) or SYNCHRONIZE CACHE(16) command to DEVICE.
These commands are defined for SCSI block devices (see SBC-3). If suc-
cessful these commands make sure that any blocks whose latest versions
are held in cache are written to (also termed as "synchronized with")
the medium.
If the LBA and COUNT arguments are both zero (their defaults) then all
blocks in the cache are synchronized. If LBA is greater than zero while
COUNT is zero then blocks in the cache whose addresses are from and
including LBA to the highest lba on the device are synchronized. If
both LBA and COUNT are non zero then blocks in the cache whose
addresses lie in the range LBA to LBA+COUNT-1 inclusive are synchro-
nized with the medium.
OPTIONS
Arguments to long options are mandatory for short options as well.
-S, --16
performs a SYNCHRONIZE CACHE(16) command. Default is to perform
a SYNCHRONIZE CACHE(10) command.
-c, --count=COUNT
where COUNT is the number of blocks to synchronize from and
including LBA. Default value is 0. When 0 then all blocks in the
cache from and including LBA argument to the highest block
address are synchronized.
-g, --group=GN
where GN is the group number which can be between 0 and 31
inclusive. The default value is 0 . Group numbers are used to
segregate data collected within the device. This is a new fea-
ture in SBC-2 and can probably be ignored for the time being.
-h, --help
output the usage message then exit.
-i, --immed
sets the IMMED bit in the SYNCHRONIZE CACHE command. This
instructs the device, if the format of the command is accept-
able, to return a GOOD status immediately rather than wait for
the blocks in the cache to be synchronized with (i.e. written
to) the medium.
-l, --lba=LBA
where LBA is the lowest logical block address in the cache to
synchronize to the medium. Default value is 0 .
-s, --sync-nv
synchronize the (volatile) cache with the non-volatile cache.
Without this option (or if there is no non-volatile cache in the
device) the synchronization is with the medium. The SYNC_NV bit
was made obsolete in SBC-3 revision 35d.
-t, --timeout=SECS
where SECS is the number of seconds the OS allows the SYNCHRO-
NIZE CACHE(16) to complete before it tries to cancel the com-
mand. Cancelling commands (typically with the task management
function "abort task") is best avoided. Note this option is only
active together with the --16 option. The default timeout is 60
seconds for both SYNCHRONIZE CACHE(10) and SYNCHRONIZE
CACHE(16). Note that timeout issues can be avoided with the
--immed option.
-v, --verbose
increase the level of verbosity, (i.e. debug output).
-V, --version
print the version string and then exit.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+--------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+--------------------------+
|Availability | system/storage/sg3_utils |
+---------------+--------------------------+
|Stability | Pass-through uncommitted |
+---------------+--------------------------+
NOTES
With the SYNCHRONIZE CACHE(16) command LBA can be up to 64 bits in size
and COUNT up to 32 bits in size. With the SYNCHRONIZ CACHE(10) command
LBA can be up to 32 bits in size and COUNT up to 16 bits in size.
Various numeric arguments (e.g. LBA) may include multiplicative suf-
fixes or be given in hexadecimal. See the "NUMERIC ARGUMENTS" section
in the sg3_utils(8) man page.
EXIT STATUS
The exit status of sg_sync 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) 2004-2013 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_start(sg3_utils)
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from http://sg.danny.cz/sg/p/sg3_utils-1.42.tgz
Further information about this software can be found on the open source
community website at http://sg.danny.cz/sg/sg3_utils.html.
sg3_utils-1.37 July 2013 SG_SYNC(8)