http://rhn.redhat.com/errata/RHSA-2005-294.html resolves: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=124600 As an aside, I installed a stock 2.4.30 kernel on the cluster which has the 3Ware SATA card underperforming. I should find what tweaks Redhat have made in this 2.4.21-32 release.