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Takeover disabled alerts caused by network congestion

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metrocluster
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metrocluster
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Applies to

  • ONTAP 9
  • MetroCluster IP
  • AFF A250 (software iWARP)

Issue

  • Takeover disabled alerts reported in MetroCluster IP configurations:

[Node_A1: cf_main: cf.fsm.takeoverOfPartnerDisabled:error]: Failover monitor: takeover of Node_A2 disabled (unsynchronized log).

  • Takeover functionality recovers automatically in a few seconds:

[NodeA1: cf_main: cf.fsm.takeoverOfPartnerEnabled:notice]: Failover monitor: takeover of Node_A2 enabled

  • ONTAP reports network congestion events:

[Node_A1: mccip_mirror_congestion_mgr_p: mcc.network.congestion:notice]: Network congestion detected. Action taken: Increased ic_timeout to 1200 msec.

  • The ifstat output from the nodes may report high TX errors on the e0c/e0d ports.
  • High Hostos utilization caused by sw_iwarp threads

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