Please note the following when upgrading from Purity version 4.8.8 or earlier to a later version of Purity with Clustered Windows Hosts using Clustered Shared Volumes (CSVs).
CSVs and OfflineShared disk policy
Regarding CSVs in a Cluster and a host that did own a volume going offline for a reboot:
The Cluster Manager Service manages disk connections for the cluster. One host will always have ownership of a volume ( although usually not all on the same host). The Cluster Manager service does a heartbeat check for volumes, and when a owner host of a CSV loses its volume access, the Cluster Manager will notice and automatically find a new owner host to online the volume, without manual intervention.