sg_sync - send the scsi command synchronize cache
sg_sync [--count=COUNT] [--group=GROUP] [--help] [--immed] [--lba=LBA]
[--sync-nv] [--verbose] [--version] DEVICE
Send SYNCHRONIZE CACHE (10) command to DEVICE. This command is defined
for SCSI block devices (see SBC-2). If successful this command makes
sure that any blocks whose latest versions are held in (volatile) cache
are written to (also termed as "synchronized with") the medium. If the
--sync-nv option is given and the device has a non-volatile cache then
any blocks whose latest versions are held in volatile cache are written
to non-volatile cache.
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
synchronized with the medium.
Arguments to long options are mandatory for short options as well.
where COUNT is the number of blocks to synchronize from and
including LBA. Default value is 0. When 0 then all blocks in the
(volatile) cache from and including LBA argument to the highest
block address are synchronized.
where GROUP 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
feature in SBC-2 and can probably be ignored for the time being.
output the usage message then exit.
sets the IMMED bit in the SYNCHRONIZE CACHE command. This
instructs the device, if the format of the command is
acceptable, to return a GOOD status immediately rather than wait
for the blocks in the (volatile) cache to be synchronized with
(i.e. written to) the medium (or the non-volatile cache).
where LBA is the lowest logical block address in the (volatile)
cache to synchronize to the medium (or the non-volatile cache).
Default value is 0 .
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.
increase the level of verbosity, (i.e. debug output).
print the version string and then exit.
Various numeric arguments (e.g. LBA) may include multiplicative
suffixes or be given in hexadecimal. See the "NUMERIC ARGUMENTS"
section in the sg3_utils(8) man page.
The exit status of sg_sync is 0 when it is successful. Otherwise see
the sg3_utils(8) man page.
Written by Douglas Gilbert.
Report bugs to <dgilbert at interlog dot com>.
Copyright © 2004-2009 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR