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[Linux-cluster] reboot to rejoin RAC cluster?



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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