Is there a way to limit multipath failover times in order to avoid Oracle RAC cluster evictions?

Solution Verified - Updated -


  • Multipath takes too long to react during SAN failures, exceeding Oracle RAC cluster timeouts and triggering evictions.
The voting disk timeout is 200s
The network heartbeat is 30s (css_misscount)
The SDTO is 27s (short disk timeout)

The SDTO is not public-ally known

Network Ping                            Disk Ping                                                      Reboot
Completes within misscount seconds  Completes within Misscount seconds                                  N
Completes within Misscount seconds  Takes more than misscount seconds but less than Disktimeout seconds N
Completes within Misscount seconds  Takes more than Disktimeout seconds                                 Y
Takes more than  Misscount Seconds  Completes within Misscount seconds                                  Y

These messages show the SDTO
[ CSSD][xxxxxxx]clssnmPollingThread: local diskTimeout set to 27000 ms, remote disk timeout set to 27000, impending reconfig status(1)
More than disk timeout of 27000 after the last NHB (network heartbeat)


  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Oracle RAC
  • Fibre Channel SAN storage

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