WARNING: This is the _old_ Lustre wiki, and it is in the process of being retired. The information found here is all likely to be out of date. Please search the new wiki for more up to date information.
Managing Lustre Failover
From Obsolete Lustre Wiki
See section "Failover" in the OM.
http://wiki.lustre.org/index.php/Lustre_Failover - not updated since pre-2007. Most of this is covered in the OM.