This document provides information on Dell Compellent's new SC4020 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 SC4020 Storage Center, or half of the solution.  The number of users simulated was 4,500 across 2 servers, with 2,250 users per server. The mailbox size was 1GB per user. Each server has 4 databases, with one copy local and the second copy replicated to the second server. This provides redundancy through hardware and software.