Additional info - node had not ANY active OCFSv2 operations (OCFSv2 used for
backups only and from another node only). So, if system just SUSPEND all FS
operations and try to rejoin to the cluster, it all could work (moreover,
connection to the disk system was intact, so it could close file sytem
gracefully).
It reveals 3 problems at once:
- single heartbeat link (instead of multiple links)
- timeout too short (ethernet can't guarantee 10 seconds, it can guarantee 1
minute minimum);
- fencing even if system is passive and can remount / reconnect instead of
rebooting.
All we did in the lab was _disconnect 1 of trunks between switches for a few
seconds, then insert it back into the socket_. No one other application failed
(including heartbeat clusters). Database cluster was not doing anything on OCFS
in time of failure (even backups).
I will try heartbeat between loopback interfaces (and OCFS protocol) next time
(I am just curios if it can provide 10 seconds for network reconfiguration).
...
Feb 1 12:19:13 testrac12 kernel: o2net: connection to node testrac11 (num 0)
at 10.254.32.111:7777 has been idle for 10 seconds, shutting it down.
Feb 1 12:19:13 testrac12 kernel: (13,3):o2net_idle_timer:1310 here are some
times that might help debug the situation: (tmr 1170361135.521061 now
1170361145.520476 dr 1170361141.852795 adv 1170361135.521063:1170361135.521064
func (c4378452:505) 1170361067.762941:1170361067.762967)
Feb 1 12:19:13 testrac12 kernel: o2net: no longer connected to node testrac11
(num 0) at 10.254.32.111:7777
Feb 1 12:19:13 testrac12 kernel: (1855,3):dlm_send_remote_convert_request:398
ERROR: status = -107
Feb 1 12:19:13 testrac12 kernel: (1855,3):dlm_wait_for_node_death:371
5AECFF0BBCF74F069A3B8FF79F09FB5A: waiting 5000ms for notification of death of
node 0
Feb 1 12:19:13 testrac12 kernel: (1855,1):dlm_send_remote_convert_request:398
ERROR: status = -107
Feb 1 12:19:13 testrac12 kernel: (1855,1):dlm_wait_for_node_death:371
5AECFF0BBCF74F069A3B8FF79F09FB5A: waiting 5000ms for notification of death of
node 0
Feb 1 12:22:22 testrac12 kernel: (1855,2):dlm_send_remote_convert_request:398
ERROR: status = -107
Feb 1 12:22:22 testrac12 kernel: (1855,2):dlm_wait_for_node_death:371
5AECFF0BBCF74F069A3B8FF79F09FB5A: waiting 5000ms for notification of death of
node 0
Feb 1 12:22:27 testrac12 kernel: (13,3):o2quo_make_decision:144 ERROR: fencing
this node because it is connected to a half-quorum of 1 out of 2 nodes which
doesn't include the lowest active node 0
Feb 1 12:22:27 testrac12 kernel: (13,3):o2hb_stop_all_regions:1889 ERROR:
stopping heartbeat on all active regions.
Feb 1 12:22:27 testrac12 kernel: Kernel panic: ocfs2 is very sorry to be
fencing this system by panicing
Feb 1 12:22:27 testrac12 kernel:
Feb 1 12:22:28 testrac12 su: pam_unix2: session finished for user oracle,
service su
Feb 1 12:22:29 testrac12 logger: Oracle CSSD failure. Rebooting for cluster
integrity.
Feb 1 12:22:32 testrac12 su: pam_unix2: session finished for user oracle,
service su
...
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