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SQL cluster lost connection to iSCSI LUN intermittently

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Category:
ontap-9
Specialty:
san
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Applies to

  • ONTAP 9
  • iSCSI
  • SAN

Issue

  • SQL cluster lost connection to iSCSI LUN intermittently
  • Windows server reports below events:

    •  Event ID 9001
      The database log was taken offline. Usually this signifies a catastrophic failure that requires the database to restart.

    • Event ID 17053
      Generic operating system error occurred. Not clear what the resulting state is.

    • Event ID 833
      This message indicates that SQL Server has issued a read or write request from disk, and that the request has taken longer than 15 seconds to return. This error is reported by SQL Server and indicates a problem with the I/O subsystem. You might also notice other symptoms associated with this message: high wait times for PAGEIOLATCH waits, warnings, or errors in the system event log, indications of disk latency issues in system monitor counters. Monitor sys.dm_io_virtual_file_stats and choose appropriate storage tier and IOPS for your storage throughput.

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