I''m trying to implement Lustre failover and I think I''ve gotten things working. Clients that are connected when the failover happens keep disk I/O through the failover. Now, I''m testing if a client tries to mount the FS when the MGS is in failover and I can''t seem to get it to work. Situation: Lustre 1.6.0.1 on Debian etch vanilla 2.6.20.12 kernel head2-1 is the MGS primary server (along with one MDT and 2 OSTs, one OST will be moved to another machine later) head2-2 is the fail-over for all of head2-1 services and has 1 MDT and 2 OST as its primary serives which failover to head2-1 All MDTs and OSTs have both machines listed as MGSnodes and each have their partner as failnodes. When I execute: mount -t lustre head2-2@o2ib:head2-1@o2ib:/home /home I get the following error message: mount.lustre: mount 192.168.1.253@o2ib:192.168.1.252@o2ib:/home at /home failed: Input/output error Is the MGS running? I have the MGS on head2-1 and just swapped the order to simulate a failed condition. The Ip address is correct for our Infiniband adapters. If I swap them around it mounts just fine. What am I missing here? Also if I don''t specify o2ib, it only tries to use tcp and doesn''t seem to try to use o2ib on it''s own. Thanks, Robert LeBlanc College of Life Sciences Computer Support Brigham Young University leblanc@byu.edu (801)422-1882