In-Guest iSCSI for Exchange 2010

Hi, we just built and are ready to go into production with Exchange 2010 using LUNS in guest through the card Microsoft iSCSI initiator iSCSI separate network for iSCSI etc. Load tested with JetStress and everything seems fine. We just found out as snapshots are not supported with iSCSI in guest so we are concerned that the other things work or be taken in charge or another, i.e. of vmotion. So, does anyone know if we lose any other characteristic, and we need to change our minds and using ESX iSCSI? I read pieces on being comparable, that we stuck with a guest performance because that's what we know with our existing Exchange 2007 environment (physical). If we must change, is it simple?

Hey everyone who is following this thread or found via Google.  It is important to understand what is and is not supported when you are running Exchange on a virtual machine.

To be absolutely clear, combining Exchange 2010 DAG and migration technologies such as vMotion technology is supported.  You must ensure that you are running at least Exchange 2010 SP1 as well as a version of vSphere that sits on the server virtualization Validation program.

I think that the link was already posted, but here is the final link:

http://blogs.technet.com/b/Exchange/archive/2011/05/16/announcing-enhanced-hardware-virtualization-support-for-Exchange-2010.aspx

More specifically, since the post above (in bold italics):

Combining Exchange 2010 high availability solutions (database availability groups (DAG)) with hypervisor clustering high availability and migration solutions that will be moving or automatically failover servers for mailboxes that are members of a DAG between clustered root servers, is now supported.

Improved, that we did in Exchange Server 2010 SP1, with more comprehensive tests of Exchange 2010 in an environment that is virtualized, we are pleased to offer this additional deployment flexibility to our customers. Management of updated support applies to any provider of hardware virtualization that participate in the Windows Server Virtualization Validation Program (SVVP).

Logiboy123, can you provide any documents to support the statement that Microsoft does not support this configuration?  The above quotes are directly from Microsoft and are very clear that they support not only the migration of Microsoft technology, but also similar to any other provider of the hypervisor technology, provided that they are in the SVVP program.

Since vSphere is part of the SVVP, Microsoft has extended support for the technologies of migration such as vMotion, in addition to their own Live Migration.  Of course, simply support something does not automatically make it works.  If you want knots vMotion DAG works correctly, you might have settings described in this blog post extended the cluster heartbeat timeout (also a fully supported configuration change):

http://www.thelowercasew.com/vSphere-and-Exchange-Admins-can-live-in-harmony-Microsoft-finally-supports-HA-and-VMotion

To answer the original question in this post, using the Protocol in-guest iSCSI is supported and with vMotion in this configuration is supported as well.  You're not really 'give up whatever it is' using this configuration well so if it meets your needs, I would stick with it.  I prefer generally VMFS just because of the flexibility it offers, but all the world has different requirements and I have absolutely no problem with guest iSCSI if your organization requires it.

Do not forget that whatever configuration, snapshots of virtual machine are not supported for Exchange. Here is another post which goes into detail on it and cover the declaration of support for Microsoft Exchange 2010 snapshots and machine virtual: http://www.thelowercasew.com/virtual-machine-snapshots-and-tier-1-apps-not-always-supported

So in general, I would say that provided you are running the correct versions of Exchange and vSphere must then take full advantage of your configuration to use features like vMotion and HA without problem.  If you adjust your settings accordingly cluster heartbeat timeout, you should have no problem using vMotion with your knots of DAG.

Matt

http://www.thelowercasew.com

Tags: VMware

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