What happens when the storage subsystem reboots?

After you complete enabling the feature pack, the storage subsystem must be rebooted. Before the storage subsystem reboots, make sure there are no hosts or applications accessing the storage subsystem. Also make sure to back up all data.

When the storage subsystem reboots, the storage subsystem deletes any unwritten cache data to disk. This action makes sure that there is no activity and that no data is in cache during the reboot. Both controllers automatically reboot for the new feature pack to take effect. The storage subsystem returns to a responsive state after the reboot is complete.