Administrator's Guide

each server in the DAG, you must use an external load balancing method. Two possible methods
are:
• Use a hardware load balancer.
• Use the Exchange database configuration to balance the load across the CAS servers manually.
◦ MAPI Traffic: Assuming the users are evenly split between databases, use the
Set-MailboxDatabase cmdlet available from Microsoft at http://technet.microsoft.com/
en-us/library/bb123971.aspx and specify the rpcclientaccessserver parameter
equal to cas1 for half of the databases and cas2 for the other half.
◦ OWA Traffic: OWA requires persistence, so direct all OWA traffic through the first CAS.
◦ Exchange Sync (EAS): Direct all OWA traffic through the second CAS.
◦ Other protocols (POP3, IMAP, and so forth): Use DNS round-robin to get rudimentary
load balancing.
Using Microsoft Exchange Jetstress and Load Generator (optional) 33