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Frequent FC disconnections on VMware host due to faulty XBAR on Cisco MDS switch

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Applies to

  • Ontap 9
  • VMware
  • Cisco MDS switch

Issue

  • VMware host reports frequent disconnections with FC LUNs.
  • Port are reporting IO WQE errors in EMS logs as below.

Mon Jan 15 15:12:23 +0000 [NetApp-01: fct_tpd_work_thread_0: fcp.io.status:debug]: STIO Adapter:1a IO WQE failure, Handle 0x0, Type 8, S_ID: 3xxxFC, VPI: 5, OX_ID: 4xxC, Status 0x3 Ext_Status 0x1d  
Mon Jan 15 15:13:40 +0000 [NetApp-01: fct_tpd_work_thread_0: fcp.io.status:debug]: STIO Adapter:1c IO WQE failure, Handle 0x2, Type 8, S_ID: 3xxxEF, VPI: 6, OX_ID: 4xx8, Status 0x3 Ext_Status 0x16  

  • Ports on other clusters in the same environment are also reporting IO WQE errors in EMS logs.
  • These affected ports are connected to Cisco MDS switchA.
  • Ports connected to Cisco MDS switchB are not reporting any errors.
  • Rx & Tx values for all ports are in optimal range.
  • Command timeouts are seen on VMware host end.

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