Umount of OCSF2 file system controlled by Veritas Volume Manager hangs

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Environment

SUSE Linux Enterprise Server 10 Service Pack 2
SUSE Linux Enterprise Server 11
Veritas Volume Manager

Situation

An OCFS2 file system was created on Veritas Volume Manager controlled devices but the attempt to unmount it results in a hanging umount command. The umount succeeds if the block device is taken out of the Veritas Volume Manager and the OCFS2 file system is being created on a usual block device.

Resolution

Veritas Volume Manager uses the private region of the hard disk where as OCFS2 uses the whole disk to store information. The creation of OCFS2 deletes this private region and thus the unmount hangs.

Thus OCFS2 cannot be used on Veritas Volume Manager.

Disclaimer

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