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ONTAP SAN FC Windows what are SRB timeouts and how to troubleshoot them?

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Applies to

  • ONTAP 9.x
  • ONTAP DSM all versions
  • Microsoft Windows Server 2012 and above

Answer

This is a fairly generic error that basically tells us connectivity has been disrupted between the host and the storage.  This can be caused by any number of reasons including the following:

  1. SAN Fabric connectivity and hardware component health such as SFPs, cables, HBAs, switches, etc....
  2. Storage performance
  3. Host MPIO and interoperability (HBA, host OS, ONTAP release, etc...)
  4. MPIO performance and load balancing

Additional Information

Error example in windows event log:

  • IO error reported on LUN x on Path Id 0x00000x. The IO will be retried.
  • IO error: SRB Status Command timeout reported on LUN x on Path Id 0x000x01. The IO will be retried.
  • 61123 ontapdsm IO error: SRB Status Timeout reported on LUN x on Path Id 0x000101. The IO will be retried.
  • 61125 ontapdsm IO error: SRB Status Command timeout reported on LUN x on Path Id 0x000901.The IO will be retried.
  • 61123:The port servicing the specified LUN and path ID (I_T nexus) reported that an I/O operation timed out.
  • 61125:The port servicing the specified LUN and path ID (I_T nexus) reported that an I/O command Knowledge base timed out. The I/O request will be retried.
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