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CONTAP-738289: ANDU upgrade to ONTAP 9.19.1 or later aborts in post-apps phase for FlexCache origin volumes with writeback enabled

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Issue

An automated non-disruptive upgrade (ANDU) from ONTAP 9.18.1 or earlier to ONTAP 9.19.1 or later can abort in the post-apps phase on a FlexCache origin volume that has writeback enabled. The node reports:
Failed to modify the writeback enabled raid flag for FlexCache origin volume '<volume_name>' in Vserver '<vserver_name>'.
Both nodes install the target image, but the cluster is left in a paused-on-error state and the upgrade does not complete.

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