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Esx device timeout due to high  latency

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ontap-9
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Perf
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Applies to

  • ONTAP 9
  • FCP

Issue

  • Alerts like below are seen in Oncommand
The device latency in microseconds exceeded the threshold value for device nvd0 and the associated target device n/a. The threshold is 25000, execution latency is 27444, total latency is 27448, and the number of operations for this period is 32.
  • Esxi servers  timeout  and get disconnected
  • There is high latency seen as per below QOS command output for the impacted volumes
::> qos statistics volume latency show

workload wid latency nblade cluster dblade disk qos_limit qos_floor nvlog cloud flexcache sync_repl cop avscan
Workload     ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min      NVRAM      Cloud  FlexCache    SM Sync         VA     AVSCAN
-total- - 12.22ms 143.00us 11.95ms 107.00us 2.00us 0ms 0ms 15.00us 0ms 0ms 0ms 0ms 0ms
Volume1  410.54ms 73.00us 410.45ms 15.00us 0ms 0ms 0ms 2.00us 0ms 0ms 0ms 0ms 0ms
Volume2  384.68ms 66.00us 384.60ms 13.00us 0ms 0ms 0ms 1.00us 0ms 0ms 0ms 0ms 0ms
Volume3  272.12ms 70.00us 272.02ms 23.00us 0ms 0ms 0ms 2.00us 0ms 0ms 0ms 0ms 0ms
Volume4  266.23ms 87.00us 266.05ms 86.00us 0ms 0ms 0ms 4.00us 0ms 0ms 0ms 0ms 0ms

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