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AFF-A300 network interfaces flapping after data switch migration

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Applies to

  • NetApp AFF-A300
  • QLogic CNA 8324/8362 adapters
  • Dell EMC S5296F-ON (SmartFabric OS10)

Issue

  • During a core network switch migration, both controllers of the AFF-A300 cluster experienced severe and repeated flapping of all physical network interfaces (e0e, e0f, e0g, e0h) within their interface groups.
  • Ports intermittently left and rejoined the interface group, resulting in loss of connectivity and access to data.
  • Multiple production application outages and corruption reported
  • Several SQL clusters remain in a degraded state, causing management concern over storage platform reliability.
  • CRC errors were observed on affected ports during the incident.
  • The issue was isolated to AFF-A300 systems; other NetApp systems (AFF-A800, FAS-8300) did not experience similar problems when connected to the same new switches.

Sat Jun 27 08:06:33+0000 [node02:nblade1:netif.linkDown:info]: Ethernet e0h: Link down, check cable.

Sat Jun 27 08:06:35+0000 [node02:nblade1:netif.linkDown:info]: Ethernet e0f: Link down, check cable.

Sat Jun 27 12:11:35+0000 [node02:intr:netif.linkDown:info]: Ethernet e0f: Link down, check cable.

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