These kernels have support for the XFS file system from SGI.

       kernel-2.4.21-37.EL.XFS.ia32e.rpm
       kernel-2.4.21-37.EL.XFS.x86_64.rpm
       kernel-smp-2.4.21-37.EL.XFS.x86_64.rpm

These contain additional kernel modules.

       kernel-smp-unsupported-2.4.21-37.EL.XFS.x86_64.rpm
       kernel-unsupported-2.4.21-37.EL.XFS.ia32e.rpm
       kernel-unsupported-2.4.21-37.EL.XFS.x86_64.rpm

You will also need to install the appropriate kernel-module-xfs-2.4.21-37.EL.???

       kernel-module-xfs-2.4.21-37.EL.XFS-1.3.3-1.SL.ia32e.rpm
       kernel-module-xfs-2.4.21-37.EL.XFS-1.3.3-1.SL.x86_64.rpm
       kernel-module-xfs-2.4.21-37.EL.XFSsmp-1.3.3-1.SL.x86_64.rpm

If you install one of the above kernels and you have openafs then you will
need to update to the appropriate one of these.

       Will be provided later.