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

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Category:
ontap-9
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san
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Applies to

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

Answer

  1. IO communication between initiator and target is delayed for one or a combination of
    1. Target performance
    2. Initiator MPIO environment and interoperability
      1. MPIO setup
      2. MPIO link saturation
    3. SAN multipath IO (MPIO) performance and load balancing
    4. SAN Fabric configuration and hardware component health

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.