Clearing Microsoft Cluster Persistent Reservations

Recently I had the active node on a Microsoft cluster go down hard.  There were 3 applications running in this cluster and 2 came up.  The third would not come up so with a little Googling I found this article from SQLShip.

Microsoft clusters put a reservation on the disk to prevent other nodes from being able to write to them. If that reservation is not cleared and is brought offline then no one will be able to use it.

Go to command prompt with elevated privileges and type in this command.  Replace the # with the disk number that is giving you issues.  This should clear the reservation and allow you to bring everything up.

cluster node servername /clearpr:#


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