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Host-Side High IO Wait Observed with No Underlying E-Series Issues Detected

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Applies to

  • NetApp E-Series E2812
  • SANtricity OS 11.90GA
  • iSCSI Protocol
  • VMware ESXi 8.0.3 (Build 24674464)

Issue

  • The host team reported elevated I/O waits and application unresponsiveness for a VM using the NetApp LUN . 
  • The VM experienced SCSI aborts and reset errors, and the database became inaccessible. 
  • No alerts or errors reported on the E-Series storage system during the issue window.
  • iSCSI session logs showed stable connections; no disconnections or port failures.
  • MEL (Major Event Log) and Recovery Guru: No relevant events.
  • Performance metrics: No abnormal latency or IOPS drops on storage during the incident.
  • Impact was limited to a single VM; other VMs on the same LUN were unaffected.

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