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Appendix A. Converting a File System from GFS to GFS2
Use the
gfs2_convert command. To convert a GFS file system to a GFS2 file system.
Warning
Before converting the GFS file system, you must back up the file system, since the conversion process is irreversible and any errors encountered during the conversion can result in the abrupt termination of the program and consequently an unusable file system.
Before converting the GFS file system, you must use the
gfs_fsck command to check the file system and fix any errors.
If the conversion from GFS to GFS2 is interrupted by a power failure or any other issue, restart the conversion tool. Do not attempt to execute the
fsck.gfs2 command on the file system until the conversion is complete.
Note
GFS2 file systems do not provide support for Context-Dependent Path Names (CDPNs), which allow you to create symbolic links that point to variable destination files or directories. To achieve the same functionality as CDPNs in GFS2 file systems, you can use the
bind option of the mount command.
The
gfs2_convert command identifies CDPNs and replaces them with empty directories with the same name. In order to configure bind mounts to replace the CDPNs, however, you need to know the full paths of the link targets of the CDPNs you are replacing. Before converting your file system, you can use the find command to identify the links.
The following command lists the symlinks that point to a
hostname CDPN:
find /mnt/gfs -lname @hostname
[root@smoke-01 gfs]# find /mnt/gfs -lname @hostname
/mnt/gfs/log
Similarly, you can execute the
find command for other CDPNs (mach, os, sys, uid, gid, jid). Note that since CDPN names can be of the form @hostname or {hostname}, you will need to run the find command for each variant.
For more information on bind mounts and context-dependent pathnames in GFS2, see Section 4.12, “Bind Mounts and Context-Dependent Path Names”.
When converting full or nearly full file systems, it is possible that there will not be enough space available to fit all the GFS2 file system data structures. In such cases, the size of all the journals is reduced uniformly such that everything fits in the available space.
- Make a backup of your existing GFS file system.
- Unmount the GFS file system from all nodes in the cluster.
- Execute the
gfs_fsckcommand on the GFS file system to ensure there is no file system corruption. - Execute
gfs2_convert. The system will display warnings and confirmation questions before convertinggfsfilesystemgfsfilesystemto GFS2.
The following example converts a GFS filesystem on block device
/dev/shell_vg/500g to a GFS2 filesystem.
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