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Disk bottleneck may impact VMware LUN performance and timeouts

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • VMware ESXi
  • NFS, iSCSI, or FCP Datastores

Issue

  • Significant performance issues for NFS volumes, or FCP or iSCSI LUNs on a VMWare ESXi cluster or also iSCSI LUN timeouts
  • VMs are slow on reads or writes
  • qos statistics shows high disk latency
    • Example: vol1 has high disk latency

Workload            ID    Latency    Network    Cluster       Data     Disk    QoS Max    QoS Min      NVRAM  
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -     4.33ms   198.00us     9.00us  1221.00us     2.88ms        0ms        0ms    13.00us
vol1             32140   177.16ms   113.00us   226.00us   108.03ms    68.79ms        0ms        0ms     2.00us

 

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