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Exchange 2010SP1 - Local Mailbox move is slow

Posted on 2012-09-06
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Last Modified: 2016-11-23
Hi guys,
I'm mid populating new Databases as part of our DAG setup - I've inherited a 500GB database on a Exchange 2010 SP1 Hyper-V VM and want to break this down to small databases rather than setting a database replica on the new (physical server).

I've setup my DAG, made copies (activation preference 1 on the server with the large DB) and am starting local mailbox moves; however I'm finding that the moves (effectively on the same server - just to a different VHD drive) are pig slow... For example a 160MB mailbox has taken in excess of 45 minutes, which just isn't right.

I've increased the number of concurrent moves in the msexchangereplication config and although it allows me to move more concurrently it's still just as slow.

The VM is hosted on a hyperV core server (dell r410) with broadcom NICS, connecting to a SAN in the same datacentre for cluster storage. Ive read about issues with IP checksum offloading causing latency and IO issues, could this be the cause?


Any advice would be welcome.
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Question by:amerrigan
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by:Stelian Stan
ID: 38372886
Change the concurrent connections: http://blogs.technet.com/b/nawar/archive/2010/10/06/slow-mailbox-move-with-exchange-2010-sp1.aspx

and restart the CAS servers after that.
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by:amerrigan
ID: 38372897
I've increased the number of concurrent moves in the msexchangereplication config and although it allows me to move more concurrently it's still just as slow.

Already done that :)
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Expert Comment

by:Stelian Stan
ID: 38372913
Did you
Don’t forget to restart the Microsoft Exchange Mailbox Replication service and do this configuration change on all your CAS servers
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Author Comment

by:amerrigan
ID: 38372981
Of course :)

Even when moving one mailbox at a time (180MB) it took 45 minutes to complete, some of the mailboxes are over 25GB and would take days at this reckoning.
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Accepted Solution

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Stelian Stan earned 2000 total points
ID: 38373336
Check the RPC CAS property:
get-MailboxDatabase | FL Name, RPCClientAccessServer

Make sure is pointing to your server. If not change it:
Get-MailboxDatabase | Set-MailboxDatabase -RPCClientAccessServer "Active CAS"
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Author Closing Comment

by:amerrigan
ID: 38374155
You sir are my new Hero!

The RPC CAS Servers were indeed pointing at the second site, now they only take a few minutes a piece to move.

Thanks again
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Expert Comment

by:Stelian Stan
ID: 38374437
Glad I could help you and save you some precious time !!!
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