We have a client with two 2010 Exchange servers (fully patched and updated) in a virtual environment. Each server holds the CAS/HT/Mailbox roles. There is have a hardware load balancer. The mailbox servers are configured in a DAG. When doing a manual switchover of databases from one server to another, the CPU on the server that was holding the passive copy of the database goes to 100% with store.exe using at least 60% CPU. What should standard CPU usage be during a switchover? From a user perspective they see a 30 second outage in their Outlook. The client tells us that they were told that there should be no user outage during a switchover. Looking for documentation, one way other, discussing whether a user outage should or should not occur during a switchover.
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