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CONTAP-779177: FSx ONTAP node disruption during upgrade due to NVRAM version mismatch

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ontap-9
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hw
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Issue

During a mid-upgrade of an FSx ONTAP cluster, the serving node encountered a disruption during takeover, resulting in a brief period of filesystem unavailability.
The disruption was triggered when takeover was attempted while the nodes were running different ONTAP versions.
[FsxId0000000000000000-01:cf_takeover:wafl.nvlog.checkFail:debug]: Could not replay WAFL NVlog: NVLOG Version Mismatch
[FsxId0000000000000000-01:cf_takeover:wafl.nvlog.versionFail:alert]: Could not replay WAFL NVlog: nvlog format is of a prior or future release
[FsxId0000000000000000-01:cf_takeover:wafl.takeover.replay.fail:debug]: WAFL takeover: WAFL replay failed with error code 1.
[FsxId0000000000000000-01:cf_takeover:sk.panic:alert]: PanicString: WAFL_takeover: panicking to dump faulty partner nvlog in SK process cf_takeover on release 9.18.1P5(C)
[FsxId0000000000000000-01:cf_takeover:cf.fm.panicToInProgress:alert]: Failover monitor: Panic during takeover; takeover will be disabled on reboot.

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