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       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.

       -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.


       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