NAME

       defragfs.ocfs2 - online defragmenter for ocfs2 filesystem

SYNOPSIS

       defragfs.ocfs2 [-c] [-v] [-l] [-g] [-h][target]...

DESCRIPTION

       defragfs.ocfs2   reduces   fragmentation  of  ocfs2  based  file.  The  file  targeted  by
       defragfs.ocfs2 is created on ocfs2 filesystem  The  targeted  file  gets  more  contiguous
       blocks and improves the file access speed.

       target  is  a  regular file, a directory, or a device that is mounted as ocfs2 filesystem.
       If target is a directory, defragfs.ocfs2 reduces fragmentation of  all  files  in  it.  If
       target is a device, defragfs.ocfs2 gets the mount point of it and reduces fragmentation of
       all files in this mount point.

OPTIONS

       -c     Print the numbers of files that should be processed

       -v     verbose mode, the current fragmentation count and the ideal fragmentation count are
              printed for each file.

              If this option is specified, target is never defragmented.

       -l     defragfs.ocfs2  will run in low io mode, which means it will regularly yield cpu to
              allow other processes to run.

       -g     defragfs.ocfs2 regularly records the current progress. So if it is interrupted, the
              next time you run defragfs.ocfs2 with this option, it will resume from the recorded
              progress.  Note that if this option is specified, other  options  are  ignored  and
              replaced by those that were recorded.

       -h     Print help info

NOTES

       defragfs.ocfs2  does not support files in lost+found directory. When target is a device or
       a mount point, defragfs.ocfs2 doesn't defragment files in mount point of other device.

       It is completely not recommended to run against a file while it  is  actively  in  another
       application.   Since  the  read/write  of a file involves a dlm lock, this can result in a
       performance slowdown to both defragfs.ocfs2 and the application due to contention.

       If the file system's free space is fragmented, or if  there  is  insufficient  free  space
       available, defragfs.ocfs2 may not be able to improve the file's fragmentation.

       Non-privileged  users  can  execute  defragfs.ocfs2  to  their  own file. Therefore, it is
       desirable to be executed by root user.

AUTHOR

       Written by Larry Chen <lchen@suse.com>