When you need to restore each database in your configuration individually, you can configure your system to contain a Storage Group; a LUN for each of the individual databases; another LUN to contain transaction logs and SnapInfo directory; and an Exchange host.
The following illustrated example configuration has one Storage Group with two databases. Because you require the ability to restore either of the databases individually, place each database on its own LUN. Therefore, you require three LUNs for this configuration, as shown in the following diagram.
