This solution brief provides an HP ProLiant SL4540 Gen8 Server and HP Smart Array P420i storage solution for Microsoft® Exchange Server 2010 (Exchange), based on the Microsoft Exchange Solution Review Program (ESRP) – Storage Program.
This solution implements the Database Availability Group (DAG) mailbox resiliency features found in Microsoft Exchange Server 2010.
This feature is the base component of the high availability and site resilience framework built into Exchange.
A DAG is a group of up to 16 mailbox servers that host a set of databases and provides database-level recovery from failures that affect individual servers or databases.
This solution brief describes a tested configuration for deploying Microsoft Exchange Server 2010 (Exchange) in a 10,500 user mailbox resilient environment. The performance results and best practices outlined in this document provide tested guidelines for configuring Exchange with the HP ProLiant SL4540 Gen8 Server in a direct attached storage (DAS) storage solution. It is designed around a building block approach with a multi-copy high availability design using a database availability group (DAG) and can be used to scale to large numbers of users. The DAG provides high availability with multiple copies in a primary datacenter location, and an optional secondary datacenter or disaster recovery (DR) location. This design is based on a specific number of servers per DAG which determines the number of users that can be hosted on a single server in a failover scenario.
Find the document here.