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B.2. GFS to GFS2 Conversion Procedure

Use the following procedure to convert a GFS file system to a GFS2 file system.
  1. On a Red Hat Enterprise Linux system, make a backup of your existing GFS file system.
  2. Unmount the GFS file system from all nodes in the cluster.
  3. Execute the gfs_fsck command on the GFS file system to ensure there is no file system corruption.
  4. Execute gfs2_convert gfsfilesystem. The system will display warnings and confirmation questions before converting gfsfilesystem to GFS2.
  5. Upgrade to Red Hat Enterprise Linux 6.
The following example converts a GFS file system on block device /dev/shell_vg/500g to a GFS2 file system. 
[root@shell-01 ~]#  /root/cluster/gfs2/convert/gfs2_convert /dev/shell_vg/500g 
gfs2_convert version 2 (built May 10 2010 10:05:40)
Copyright (C) Red Hat, Inc.  2004-2006  All rights reserved.

Examining file system..................
This program will convert a gfs1 filesystem to a gfs2 filesystem.
WARNING: This can't be undone.  It is strongly advised that you:

   1. Back up your entire filesystem first.
   2. Run gfs_fsck first to ensure filesystem integrity.
   3. Make sure the filesystem is NOT mounted from any node.
   4. Make sure you have the latest software versions.
Convert /dev/shell_vg/500g from GFS1 to GFS2? (y/n)y
Converting resource groups...................
Converting inodes.
24208 inodes from 1862 rgs converted.
Fixing file and directory information.
18 cdpn symlinks moved to empty directories.
Converting journals.
Converting journal space to rg space.
Writing journal #1...done.
Writing journal #2...done.
Writing journal #3...done.
Writing journal #4...done.
Building GFS2 file system structures.
Removing obsolete GFS1 file system structures.
Committing changes to disk.
/dev/shell_vg/500g: filesystem converted successfully to gfs2.
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