[Linux-cluster] reboot to rejoin RAC cluster?

Morrison, Bradley A bradley.a.morrison at jpmchase.com
Thu Jan 6 17:01:32 UTC 2011


Q: Can I reboot one node in a two-node cluster and have it rejoin the cluster?

I've a two-node cluster which recently had HBAs replaced on both cluster nodes.
Node 1 was ejected sometime after its latest reboot, and now won't mount its OCFS volumes. The volumes' headers are verified from n1, i.e., it can see the volumes, but mounting fails. Restarting o2cb yields "modprobe: FATAL: Module ocfs2_stackglue not found."

I want to reboot n1 IFF this will have it rejoin the cluster - unless there's another way to have n1 rejoin the cluster w/o reboot.

Status for n1:
n1# service o2cb status
Driver for "configfs": Loaded
Filesystem "configfs": Mounted
Driver for "ocfs2_dlmfs": Loaded
Filesystem "ocfs2_dlmfs": Mounted
Checking O2CB cluster ocfs2: Online
Heartbeat dead threshold = 61
  Network idle timeout: 30000
  Network keepalive delay: 2000
  Network reconnect delay: 2000
Checking O2CB heartbeat: Not active
n1#

Status for n2:
n2# service o2cb status
service o2cb status
Driver for "configfs": Loaded
Filesystem "configfs": Mounted
Driver for "ocfs2_dlmfs": Loaded
Filesystem "ocfs2_dlmfs": Mounted
Checking O2CB cluster ocfs2: Online
Heartbeat dead threshold = 61
  Network idle timeout: 30000
  Network keepalive delay: 2000
  Network reconnect delay: 2000
Checking O2CB heartbeat: Active
n2#


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