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CONTAP-479064: Cluster Inaccessible Following 9.16.1P4 Upgrade and Unsuccessful GDD Enabling

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Issue

After the upgrade, enabling GDD failed due to file moves in progress.
Shortly after, the cluster experienced severe latency (hundreds to thousands of seconds) and became inaccessible.
EMS logs showed repeated wafl.access.fenced.file events.
File moves were stuck in the "Preparing" state with CSM_TIMEOUT errors.

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