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VMware Datastore Timeout on FC environment after Link Reset on Brocade Switch

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ontap-9
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Applies to

  • ONTAP 9
  • VMware ESXi
  • Fiber Channel (FC)

Issue

  • VMware datastore lost access to volume causing a production outage
  • Link reset occurred on the Switch port
  • Storage adapter resets after connectivity timeout between host and storage
Tue Jan 06 04:37:31 [Cluster-01: fct_tpd_thread_2: fcp.io.status:debug]: STIO Adapter:1c, found hung cmd:0xfffff82cd2f3db20(state=5, flags=0x0, ctio_sent=1/1,RecvExAddr=0xcd5, OX_ID=0x4a04, RX_ID=0xffff,SID=0x1xxxx3, Cmd[2A], req_q_free:0)
  • Path timeouts and state in doubt seen on VMware ESXi host vmkernel logs:
026-01-06T04:36:35.128Z In(182) vmkernel: cpu36:2097285)NMP: nmp_ThrottleLogForDevice:3893: Cmd 0x89 (0x45ca0b9b5ax0, 2097232) to dev "naa.600a0980xxxxxxxxxxxxxxxxxxxxxxx" on path "vmhba2:C0:T1x:Lx" Failed:
2026-01-06T04:36:35.128Z In(182) vmkernel: cpu36:2097285)NMP: nmp_ThrottleLogForDevice:3898: H:0x5 D:0x0 P:0x0 . Act:EVAL. cmdId.initiator=0x430a4d7f5bx0 CmdSN 0x401b8a
2026-01-06T04:36:35.128Z Wa(180) vmkwarning: cpu36:2097285)WARNING: NMP: nmp_DeviceRequestFastDeviceProbe:235: NMP device "naa.600a0980xxxxxxxxxxxxxxxxxxxxxxx" state in doubt; requested fast path state update...

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