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Node Panic During Cluster Switch Firmware Upgrade

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Applies to

  • NetApp AFF-A250
  • ONTAP 9
  • BES-53248 Switches (Broadcom)

Issue

During a planned firmware upgrade and reboot of BES-53248 cluster switches in a two-node NetApp AFF-A250 cluster with following FPVR running ONTAP 9.15.1

  • Two-node clusters with FPVR-approved non-standard cluster/HA cabling (e.g., e0c/e2a as cluster ports connected with cluster switch, e0d as HA interconnect directly without switch/back-to-back)

The following symptoms occurred:

  • Node panic and automatic takeover during switch reboot.
  • Cluster port (e2a) experienced repeated link down/up (flapping) events.
  • CLAM (Connectivity, Liveliness and Availability Monitor) reported out-of-quorum and triggered a node panic/takeover.
  • Event logs showed:

[vifmgr.clus.linkdown:EMERGENCY]: The cluster port e2a on node node-01 has gone down unexpectedly.PANIC: Received PANIC packet from partner, receiving message is (Coredump and takeover initiated because Connectivity, Liveliness and Availability Monitor (CLAM) has determined this node is out of quorum.)

  • The issue was reproducible: occurred on both switch reboots, but only on this cluster (other clusters with similar upgrades did not experience the issue).

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