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Intermittent latency spikes and latency on remote disk

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ontap-9
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perf
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Applies to

  • ONTAP 9
  • AFF -A400
  • MetroCluster
  • Disk X4013S17337T6NTE

Issue

  • High latency observed at certain times along with service outage on ESXI datastores
  • EMS logs shows the following messages during the time of the issue

[XXXXXX-XX:wafl_exempt18: wafl.cp.toolong:error]: Aggregate XXXX_XXXX_aggr1 experienceda long CP

[XXXXXX -XX:disk_latency_monitor: shm.ssd.threshold.ioLatency:notice]: SSD 0v.i1.2L20 hasexceeded the expected block latency in the current timeframe with an averagelatency of 4670 us and an average utilization of 11 percent. The next highestSSD latency: 110 us. Disk 0v.i1.2L20 Shelf 10 Bay 22 [NETAPP  X4013S17337T6NTE NA53] S/N [S60RNA0R900618] UID[36305230:52900618:00253841:00000002:00000000:00000000:00000000:00000000:00000000:00000000 

  • Back to back CP is observed with most time spent on P2 Flush phase
  • Latency is from one of the disks on the remote plex
  • Frequent disk failures seen on disk of the model [X4013S17337T6NTE] On the same Shelf 

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