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Fabric MetroCluster high write latency

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Applies to

  • Fabric MetroCluster
  • ONTAP 9
  • Brocade FC switches
  • ATTO 7500N/7600N fibrebridge

Issue

  • Write latency is high across all SVMs and volumes.
  • porterrshow in supportshow output from the backend switches shows no errors.
  • EMS logs show repeated SCSI command aborted errors all indicating the same bridge:

Mon May 22 11:25:54 +0200 [cluster01_node01: slifc_intrd:scsi.cmd.abortedByHost:error]: Disk device switch001:7.126L39: Command aborted by host adapter: HA status 0x4: cdb 0x88:000000014c718748:00000008.

Mon May 22 11:26:47 +0200 [cluster01_node01: slifc_intrd:scsi.cmd.abortedByHost:error]: Disk device switch001:7.126L31: Command aborted by host adapter: HA status 0x4: cdb 0x9a:000000014c79ae00:0001:0200.

Mon May 22 11:27:57 +0200 [cluster01_node01: slifc_intrd:scsi.cmd.abortedByHost:error]: Disk device switch001:7.126L36: Command aborted by host adapter: HA status 0x4: cdb 0x28:d9746598:0018.

  • Latency returns to a normal level when the switch port connected to the affected bridge is disabled.

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