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Panics after migration to switchless cluster from 40G to 100G connections

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ontap-9
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hw
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Applies to

  • AFF C800
  • ONTAP 9

Issue

  • New nodes added to cluster and data migrated via volume move.
  • After migration completed, old nodes removed from cluster and cluster transitioned from switched to switchless.
  • During this process, cables changed from 40G copper to 100G copper on cluster ports e0a and e1a.
  • After this swap, large number of CRC errors and long frames reported on both cluster ports on one node.
  • NodeIfInErrorsWarnAlert reported and system health subsystem show reports degraded cluster.
  • Node reporting CRC errors panics several times:
PANIC: Unknown key type 0 in SK process wafl_exempt18 on release 9.11.1P14 (C)
PANIC: protection fault on VA 0 code 0 cs:rip 0x20:0xffffffff8a950af0 in process NwkThd_00 on release 9.11.1P14 (C)
  • Aggregates on panicking node go to unknown state (causing outage) with discrepancies between VLDB/WAFL in debug vreport show output.

 

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