The latest kernel-module-openafs update for SL 5.1 can't be installed:

kernel-module-openafs-2.6.18-92.1.6.el5-1.4.7-68.SL5.x86_64.rpm
requires openafs >= 1.4.7, however SL 5.1 only has openafs-1.4.6.

Thanks.