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Exchange 2010 DAG running as guests VM's on a 2008 R2 HA Cluster, supported?

futureman0
futureman0 asked
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Last Modified: 2012-05-08
I've been digging around trying to figure out if Exchange 2010 using DAG between two servers is supported (or un-officially supported) running as guests VM's on a 2 node 2008 R2 Hyper-V HA cluster in a production environment (very small though, 20 mailboxes).

Everything seems fine until I get to this part -

"Microsoft doesn't support combining Exchange high availability solutions (database availability groups (DAGs)) with hypervisor-based clustering, high availability, or migration solutions. DAGs are supported in hardware virtualization environments provided that the virtualization environment doesn't employ clustered root servers."

FROM: http://technet.microsoft.com/en-us/library/aa996719%28EXCHG.140%29.aspx

I find this very odd is this would also exclude VMWare ESX hypervisor using vmotion as well, which is just strange.

Anyone know anymore about this?
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Commented:
The simple answer is that you use one or the other.

If you want to use high availability from a cluster which the VM sits on, then use that.
If you want to use DAG, then don't use clustering or VMOTION etc. It will simply screw things up. The DAG spreads the data between multiple servers, and doing so makes it imcompaible with those other types of technologies.
It might work, but then you are at risk of data loss. Microsoft would then turn round to you and say "not supported".

One of the joys of being bleeding edge is that you cannot have the benefit of experience with the product. Whiel the TAP and other programmes have shown what can and cannot work, those are mainly going towards larger environments. In six or nine months time, once a few people with a lot of knowledge of Exchange have played around with the configuration, the advice may well change.

Do you want to be that guinea pig, and potentially lose all data?

Simon.

Author

Commented:
Thanks for the verification. Looks like Exchange 2007 wasn't supported using HA options either in a ESX/Hyper-V.

Given the light load, 20 mailboxes at around 1gb per box, is having only one Exchange server sufficient for running all the required rolls on the cluster mentioned above? Thanks for your help! In terms of DR I will be using Backup Exec for backing up mail boxes.
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Commented:
I have set up a new Echange 2010 environment running on two different sites.

Site 1 - Hyper-v Server 2008 R2
VM: Exchange 2010 SP1 (1 nic)

Site 2 - Hyper-v Server 2008 R2
VM: Exchange 2010 SP1 (1 nic)

I have all roles installed on both and I want to use DAG. However when I set this up everything seems fine until Site 1 server starts rebooting or frezzing. I get now error message or anything that I can find it just totally dies. This triggers the switchover so that part works.

So what I did was to uninstall the DAG and reinstall the server on Site 1 from bottom up. Now after a day the same behavior appears. Right now I have removed the DAG to see if it runs smoothly on one server now.

I've seen at lot of discussions around this and is wondering am I missing some setting or why does this happen?
Findwise, did you ever solve the DAG issue?
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