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Random iSCSI disconnects due to custom protection domain rebalancing conflict

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Category:
element-software
Specialty:
solidfire
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Applies to

  • NetApp SolidFire Element software 12.0
  • Clusters with Custom Protection Domains configured

Issue

  • Random iSCSI disconnects occur on hosts connected to a SolidFire cluster
  • Kubernetes pods fail, and PVCs become unavailable or read-only; filesystems are left in a broken state
  • SolidFire event log shows alternating events every ~15 minutes:
    • Slice Reassignment: Balancing volumes for zone tolerance
    • Slice Reassignment: Balancing volumes for performance
  • No errors in SolidFire node logs
  • Packet trace shows:
    • SCSI Check Condition, Sense Key Not Ready (0x02), ASC/ASCQ Logical Unit Is In Process Of Becoming Ready (0x0401) in response to Test Unit Ready commands

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