When you need to restore individual database in a configuration having multiple Storage Groups, you can configure your system to contain multiple Storage Groups; LUNs for all of your databases; separate LUNs for databases that you need to restore individually; another LUN to contain transaction logs and SnapInfo directory; and an Exchange host.
The following illustrated example configuration has two Storage Groups with three databases each. With this configuration, you can restore database C in Storage Group 1 without restoring any of the other databases in its Storage Group. However, you have to restore databases A and B at the same time. You require a total of five LUNs for this configuration, as shown in the following diagram.
Note: Configuring many databases on their own LUNs for individual restore operation can cause you to have insufficient number of drive letters.
