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VMware reports lost access to volumes due to disk overutilization

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Category:
ontap-9
Specialty:
Perf
Last Updated:

Applies to

  • ONTAP 9
  • FAS2750
  • SAN
  • VMware ESXi

Issue

  • VMware events report many lost access events:

Lost access to volume 62b95f50-24080746-2452-0025b5342a6f (datastore1) due to connectivity issues.

  • Node reports high latency:
VMware reports lost access to volumes due to disk overutilization
  • 10K HDDs show transfers far above their expected performance, e.g. near 300 instead of 120:
VMware reports lost access to volumes due to disk overutilization
  • Disks are 100% busy much of the time:

Disks are 100% busy much of the time

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