OCFS2 File System Hanging or Mounting Read Only

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Environment

SUSE Linux Enterprise Server 11
SUSE Linux Enterprise Server 10
SUSE Linux Enterprise High Availability Extension (HAE)

Situation

The OCFS2 file system hangs on each member of the HAE cluster. The following error has been recorded in the /var/log/messages system log file.

kernel BUG at /usr/src/packages/BUILD/ocfs2-1.4/default/ocfs2/heartbeat.c:67

Checking OCFS2 meta data shows a checksum error.

# debugfs.ocfs2 -n -R "stats" /dev/ocfs2_device

CRC32: fafec4ec ECC: 09e7
**FAILED CHECKSUM** Computed CRC32: b19eb0fb ECC: 0d4e

The file system mounts read only, when it is expected to mount read/write.

Resolution

The OCFS2 file system is damaged and requires a file system check. The file system will need to be unmounted before a successful file system check can be performed. Do the following to check the file system:

1. Back up all your file system data if you can.
2. Unmount the OCFS2 file system by stopping the HAE resource associated with the OCFS2 file system. If the file system is not a part an HAE cluster, then simply umount the device. You CANNOT run a fsck.ocfs2 on a mounted OCFS2 file system. It will damage it.
3. Run a file system check.

# fsck.ocfs2 -f /dev/ocfs2_device

4. If the fsck.ocfs2 command reports errors, repeat the file system check until there are no errors.
5. Start the cluster file system resource to mount the OCFS2 file system, and retest.
* The file system should mount read/write
* The debugfs.ocfs2 command should not have any **FAILED CHECKSUM** errors

Disclaimer

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