A customer has migrated a Microsoft Exchange 2007 server with several very active mailbox databases to their Symmetrix V-Max. In addition, they have decided to integrate host-based fault tolerance…

A customer has migrated a Microsoft Exchange 2007 server with several very active mailbox databases to their Symmetrix V-Max. In addition, they have decided to integrate host-based fault tolerance by utilizing Microsoft's native continuous replication technology. Which database feature, provided by Exchange to reduce the chance of data loss, will also increase disk capacity requirements on this busy mailbox server?