Assumptions: 3 node cluster. All 3 nodes are lock managers Nodes 1 and 2 mount GFS filesystems Node 1 during failure is master, node 2 and node 3 are slaves Error on node 2 is: lock_gulmd_LT000[3608]: Timeout (15000000) on idx: 2 fd:7 (node1:192.168.101.11) This error keeps repeating in the logs and GFS filesystem are totally inaccessible. To fix, the master lock manager needs to be manually expired and then rebooted because applications were accessing GFS filesystems. It looks like error message is generated from lock_io.c. Does anyone know exactly what causes this error? Thanks, Rich -- Linux-cluster@xxxxxxxxxx http://www.redhat.com/mailman/listinfo/linux-cluster