What is the minimum size LUN that will accommodate each mailbox store?

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A customer is planning the migration of Microsoft Exchange 2007 from a third-party NAS appliance to a newly purchased Symmetrix V-Max array. After determining the number of spindles required for performance, the customer would like to calculate whether the given spindles will support the LUN size required to support the mailbox stores.
The customer is using the Exchange "Heavy" user profile as a guide in estimating the LUN size for the planned 200 users per store. They have standardized on 2 GB mailboxes and would like to factor in a 20% overhead in anticipation of future growth. The customer does not perform offline maintenance on their databases. However, online maintenance does complete every 48 hours and full backups are performed nightly.
What is the minimum size LUN that will accommodate each mailbox store?
A. 518
B. 559
C. 573
D. 615

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