Exchange 2010SP1 - Local Mailbox move is slow
Posted on 2012-09-06
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.