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Cluster monitoring failed in OnCommand Unified Manager with internal error: expected one element but was

Last Updated:

Applies to

  • OnCommand Unified Manager (OCUM) 7.2+
  • Active IQ Unified Manager 9.6+
  • NetApp MetroCluster (MCC)


  • A new event is created with the following trigger condition

Monitoring failed for cluster <clustername>. Reason: An internal error has occurred during MetroCluster component refresh

  • The error listed below should be present in ocumserver.log file

ERROR [oncommand] [reconcile-5] [<example_ip>(incremental@00:04:02.256)] [c.n.dfm.collector.OcieJmsListener] Error during MetroCluster component monitoring : expected one element but was: <[Brocade_192.168.0.2:FC port0/21:Brocade_192.168.0.3:FC port 0/17], [Brocade_192.168.0.2:FC port 0/21:Brocade_192.168.0.3:FC port 0/21]>

ERROR [oncommand] [reconcile-3] [<example_ip>(incremental@00:19:01.871)] [c.n.dfm.collector.OcieJmsListener] Error during MetroCluster component monitoring : expected one element but was: <[Brocade_192.168.0.2:FC port 0/23:Brocade_192.168.0.3:FC port 0/18], [Brocade_192.168.0.2:FC port 0/23:Brocade_192.168.0.3:FC port 0/23]>

  • In this specific case, we can see that port 21 from the switch is connected to two different ports (17, 21) on the switch 

Note: Please find the log file location in the What are the notable log files and their respective locations? article


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