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CFSHELF-6299: NSM100/NSM100B/NSM140 shelf disk path loss after PCIe error in NVMe drive leads to reset

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ontap-9
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hw
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Issue

  • One or both NSM shelf modules on an NS224 disk shelf unexpectedly reset during normal operation.
  • In rare cases, a simultaneous reset of both NSMs can cause ONTAP to lose all paths to the NVMe drives in the shelf, triggering a multi-disk panic (MDP).
  • ONTAP EMS logs that rule out this problem:
    • sfu.downloadSuccess:info – A shelf firmware update will reboot each NSM to install new firmware, the messages below are expected following this event.
  • ONTAP EMS log symptoms for this problem:
    • sla.shelf.mod.reboot.unexp:error – Unexpected NSM reboot detected by ONTAP, with a "Startup type 5-Crash" message.
    • nvmeof.timeout:notice – Mass timeout of drives belonging to the same shelf following an unexpected reset.
    • scsi.cmd.selectionTimeout:error – Mass timeout of drives belonging to the same shelf from one or more network adapters.
    • netif.linkDown:info – In a direct-attached storage configuration, one or more links go down as the NSM module resets.

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