Ensure that you place your Exchange Server storage groups and databases on dedicated volumes, place your LUNs correctly, and use the minimum number of LUNs possible, for fast and successful backup and restore operations.
You should ensure that for a Continuous Cluster Replication (CCR) configuration, all Exchange servers hosting a mailbox database and its copies have same storage level configuration layout. For example, if two LUNs share the same storage volume (vol1) on host A, the same two LUNs on host B should share same storage volume (vol2).