Extremely poor performance observed on GFS2 unrelated to locking overhead - Red Hat Customer Portal

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Issue

Extremely slow read and write performance observed to and from GFS2.
Issue is present even when the filesystem is only mounted on 1 node at a time.
Issue is present even when mounted with lock_nolock.

Environment

Red Hat Enterprise Linux (RHEL) 5.3 through RHEL 5.6.
Red Hat Global Filesystem 2 (GFS2.)
Data on the affected filesystem was created or added while using a kernel earlier than one of the following:
- In RHEL 5.4 with Extended Update Support: kernel-164.36.1.
- In RHEL 5.6 with Extended Update Support: kernel-2.6.18-238.12.1.
- In RHEL 5.3 or later: kernel-2.6.18-274.
This issue does not affect GFS2 on RHEL 6 or above

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