Alex Fontana, creator of the VMware documentation about virtualizing Microsoft Exchange products told all listeners about the best practices and pitfalls you can experience.
Some information was presented last year in Barcelona, but still provided useful information which I will pass on to my Exchange friends. My highlights of this session:
- Use EagerZeroThick virtual disks instead of thin provisioned virtual disks. I believe this is only for the disks hosting mailbox databases. This due to the fact that there is a small performance penalty when writing new blocks to a thin provisioned disk.
- When having multiple virtual disks in your virtual Exchange server, configure multiple vSCSI adapters (4 is the max, so when having 4 or more virtual disks, use them all and split the virtual disks among the vSCSI adapters). During testing, this has brought the Exchange latency from 60 to around 10ms.
- Exchange latency should be under 10ms and should be no more then 20ms.
- When using vMotion, make sure you use Jumbo Frames on the vMotion network. When this is not possible, configure the ‘SameSubnetDelay’ parameter to 2000ms instead of the default 1000ms on the DAG cluster.
- Load balancing using the vCloud Networking & Security Edge is supported and works fine. No need to use a hardware or third-party load balancer.
A nice session and experienced speaker, thanks Alex!