NAME

       fsck.gfs2 - offline GFS and GFS2 file system checker

SYNOPSIS

       fsck.gfs2 [options] device

WARNING

       All  computers  must  have  the filesystem unmounted before running fsck.gfs2.  Failure to
       unmount from all nodes in a cluster will likely result in filesystem corruption.

DESCRIPTION

       fsck.gfs2 will check that the GFS or GFS2 file system on a device is  structurally  valid.
       It  should not be run on a mounted file system.  If file system corruption is detected, it
       will attempt to repair the file system.  There is a limit to what fsck.gfs2  can  do.   If
       important  file  system  structures  are destroyed, such that the checker cannot determine
       what the repairs should be, reparations could fail.

       Other file system checkers will not check the file system if it is "clean" (i.e. unmounted
       since  the  last use).  With gfs2, storage may be shared among several nodes in a cluster,
       and therefore problems may have been  introduced  on  a  different  computer.   Therefore,
       fsck.gfs2 will always check the file system unless the -p (preen) option is used, in which
       case it follows special rules (see below).

       fsck.gfs2 will log a message to the system log on start and  exit  to  aid  debugging  and
       administration.

OPTIONS

       -a     Same as the -p (preen) option.

       -f     Force checking even if the file system seems clean.

       -h     Help.

              This prints out the proper command line usage syntax.

       -q     Quiet.

       -n     No  to  all  questions.  By  specifying  this  option, fsck.gfs2 will only show the
              changes that would be made, but not make any changes to the filesystem.

              This option may not be used with the -y or -p/-a options.

       -p     Automatically repair ("preen") the file system if it is dirty and safe  to  do  so,
              otherwise exit.

              If  the file system has locking protocol lock_nolock, it is considered a non-shared
              storage device and it is considered safe.  If the locking protocol is lock_dlm  and
              -a  or  -p was specified, the check is considered unsafe as it cannot be determined
              whether the device is mounted by other nodes  in  the  cluster.   In  this  case  a
              warning  is given if any damage or dirty journals are found. The file system should
              then be unmounted from all nodes  in  the  cluster  and  fsck.gfs2  should  be  run
              manually without the -a or -p options.

              This option may not be used with the -n or -y options.

       -V     Print out the program version information.

       -v     Verbose operation.

              Print more information while running.

       -y     Yes  to  all questions. By specifying this option, fsck.gfs2 will not prompt before
              making changes.

              This option may not be used with the -n or -p/-a options.

SEE ALSO

       gfs2(5), gfs2_jadd(8), gfs2_grow(8)

                                                                                     fsck.gfs2(8)