Thursday, November 12, 2009

Exchange 2010 DAG latency between members

A question came up today in a Connections session as to what was the maximum *supported* latency between Exchange Server 2010 Database Availability Group (DAG) members. According to this TechNet article, it is 250ms.

"Database copies aren't supported between Mailbox servers with round trip network latency greater than 250 milliseconds (ms)."

I'm guessing that it would *work* with higher latencies, but I don't recommend ever exceeding the support boundaries.

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