This document provides information on Dell Compellent's storage solution for Microsoft Exchange Server, based the Microsoft Exchange Solution Reviewed Program (ESRP) – Storage program.  The solution presented here is an Exchange 2013 Mailbox Resiliency solution utilizing 1 Database Availability Group (DAG) and 2 copies of every database. The tested environment simulates all users in this DAG running on a single Storage Center, or half of the solution. The number of users simulated was 25,000 across 5 servers, with 5,000 users per server. The mailbox size was 2GB per user. Each server has 5 databases, with one copy local and the second copy replicated to the second server. This provides redundancy through hardware and software.