Ref: Mail Submission on DAG member also Hub Transport Server

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http://technet.microsoft.com/zh-tw/magazine/ff626260.aspx

Q: I’m planning to upgrade our environment from Microsoft Exchange 2007 to Exchange 2010. This implementation has to be fully redundant on all levels.Because our organization has about 3,000 users, I plan to install Exchange on two machines initially. Each will have the Hub Transport (HT), Client Access Server (CAS) and Mailbox (MB) server roles. Both will also be members of a Database Availability Group (DAG), so the servers will replicate databases between themselves.

From our experience with the current Exchange environment, I know that if the HT and MB roles are on the same machine, the Microsoft Exchange Mail Submission service always prefers the local HT server. It doesn’t use other HT servers in the Active Directory site in a round robin fashion, as do MB servers that don’t have the HT server role.

If this is the same in Exchange 2010, we have an issue. Keeping the transport dumpster on a DAG member doesn’t make sense. If the member server becomes unavailable and mailbox databases fail over to the other DAG member, the messages in the transport dumpster can’t be resubmitted.

A: I understand your concern. First, let me assure you that the Exchange product group has considered this kind of scenario. Early on in Exchange 2010 development the team made a design change. If the Exchange Mail Submission service detects that it’s running on a mailbox server part of a DAG, it won’t prefer the local HT server. Instead, it will load balance across other HT servers in the same Active Directory site. If it doesn’t find any, it will fall back to the local HT server.

HT 及DAG 在同一台時，mail submission 會使用其他可用的HT 來進行郵件傳輸

The Exchange Mail Submission service living on the MB role wasn’t the only thing the developers changed. They modified the HT role to reroute a message to another HT server in the Active Directory site if the HT role is installed on a server that also has the MB role and is part of a DAG. The group made both changes to ensure high availability when HT and MB roles coexist on a server that’s also a DAG member.

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