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Server hosted on FC LUN is experiencing latency issues

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Category:
ontap-9
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san
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Applies to

  • ONTAP 9.x
  • SQL host
  • ESXi

Issue

  • SQL server instance hosted on an FC LUNs experiencing performance issues causing latency at the application layer.
  • Or ESXi host experiencing latency and hosts rebooting continously due to performance issue.
  • WQE events for Ext_Status 0x1d on a single port began to pop up in the EMS logs corresponding when the performance issue was first observed.

Tue Apr 29 08:42:01 -0400 [Netapp1-02: fct_tpd_work_thread_0: fcp.io.status:debug]: STIO Adapter:3d IO WQE failure, Handle 0xb, Type 8, S_ID: 22F00, VPI: 276, OX_ID: 2243, Status 0x3 Ext_Status 0x1d  

  • After reviewing the output for fcp adapter show -node <node name> -adapter <adapter number> confirmed that there is a low RX light level coming from the switch port:

netapp1::> fcp adapter show -node Netapp1-02 -adapter 3d
  (network fcp adapter show)
                          Node: Netapp1-02
                       Adapter: 3d
                   [....]
        Received Optical Power: 205.1 (uWatts)
    Is Received Power In Range: true
SFP Transmitted Optical Power: 876.4 (uWatts)
     [....]

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