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
       successful 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 synchronized
       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 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 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 SYNCHRONIZE CACHE(16) to complete before it tries to cancel the command.  Can-
	      celling  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.

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) com-
       mand 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 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 (C) 2004-2013 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_start(sg3_utils)

sg3_utils-1.37							     July 2013								SG_SYNC(8)