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High Write latency with Back to back CP and scsi command error on Metrocluster

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Category:
ontap-9
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metrocluster
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Applies to

  • ONTAP 9
  • MetroCluster FC
  • Brocade back-end switch

Issue

  • High latency being reported from clients

  • scsi.cmd errors reported in event log:

Example:

[NodeA: isp2400_intrd: scsi.cmd.abortedByHost:error]: Disk device ATTO:8.126L1504: Command aborted by host adapter: HA status 0x4: cdb 0x9a:0000000121806060:0001:01a0.

Fri Apr 16 10:01:02 +0200 [sminfsa01001p: isp2400_intrd: mlm.excessive.TPlatency:notice]: Average latency of 258239us on target port 2100001086ad1f00, has exceeded 250000us

  • Low SFP TX Power on switch ports:

Switch:admin> sfpshow 8
…
RX Power: -1.5 dBm (708.8uW)
TX Power: -5.6 dBm (273.8 uW)

 

 

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