NAME¶
sg_sync - send the scsi command synchronize cache
SYNOPSIS¶
sg_sync [
--count=COUNT] [
--group=GROUP] [
--help] [
--immed] [
--lba=LBA] [
--sync-nv] [
--verbose]
[
--version]
DEVICE
DESCRIPTION¶
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.
OPTIONS¶
Arguments to long options are mandatory for short options as well.
- -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 (volatile) cache from and including LBA argument to the
highest block address are synchronized.
- -g, --group=GROUP
- 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.
- -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 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).
- -l, --lba=LBA
- 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 .
- -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.
- -v, --verbose
- increase the level of verbosity, (i.e. debug output).
- -V, --version
- print the version string and then exit.
NOTES¶
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.
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 © 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 PURPOSE.
SEE ALSO¶
sg_start(sg3_utils)