No, the intent is that you use a single technology for both, as Chuck and Simon 
alluded to.

If you want to use vSphere plus DAG - then you look to VMware for support. 
Microsoft won't support that configuration, just as they don't support Quick 
Migration plus DAG on Hyper-V.

DAG is a perfectly workable HA/FT solution, as well as a consistency solution. 
So are various other mechanisms supported by third parties, such as EMC, 
VMware, and NetApp.  Pick a solution and stick with it.

Regards,

Michael B. Smith
Consultant and Exchange MVP
http://TheEssentialExchange.com

From: Paul Hutchings [mailto:paul.hutchi...@mira.co.uk]
Sent: Tuesday, September 07, 2010 1:48 PM
To: MS-Exchange Admin Issues
Subject: RE: Exchange 2010 on vSphere - Redundancy?

Not hot spare as in automatic failover or anything, that's overkill for us, but 
the plan (not just Exchange but in general) is to replicate at SAN level 
between sites and have a vSphere box at the spare site that could mount the 
replica LUNs and give us basic functionality in a bad situation.

A DAG between two VM's in the primary location should still deal with database 
corruption as I understand it, seems you almost have to decide between host 
resilience (HA/FT) or database consistency resilience (DAGs)?

From: John Cook [mailto:john.c...@pfsf.org]
Sent: 07 September 2010 18:42
To: MS-Exchange Admin Issues
Subject: RE: Exchange 2010 on vSphere - Redundancy?

Are you talking about having a hot site in the second location for failover? 
That's a job for Site Recovery Manager. Tuning Exchange depends on number of 
mailboxes, Public folders, Full outlook (cached mode) versus OWA and how those 
resources are managed/used.

John W. Cook
Systems Administrator
Partnership For Strong Families
315 SE 2nd Ave
Gainesville, Fl 32601
Office (352) 393-2741 x320
Cell     (352) 215-6944
Fax     (352) 393-2746
MCSE, MCTS, MCP+I, A+, N+, VSP4, VTSP4

From: Paul Hutchings [mailto:paul.hutchi...@mira.co.uk]
Sent: Tuesday, September 07, 2010 1:36 PM
To: MS-Exchange Admin Issues
Subject: RE: Exchange 2010 on vSphere - Redundancy?

Hmm the devil really is in the detail isn't it.  I've not yet dug into the 
nitty gritty just the headlines/demos - so that's something else that's new.

OK let's start again :)

Assuming two separate location sites with good ethernet connectivity, both with 
vSphere, the primary location with vSphere Standard (possibly Advanced 
depending on some other things) on at least two hosts with dual physical CPUs 
what would you do to make what is, in performance terms, a single box Exchange 
server more robust?

Thanks.

From: John Cook [mailto:john.c...@pfsf.org]
Sent: 07 September 2010 18:31
To: MS-Exchange Admin Issues
Subject: RE: Exchange 2010 on vSphere - Redundancy?

You have to keep in mind that Fault Tolerance in VSphere is still restricted to 
one processor and that's not going to change anytime real soon. If you need 
high availability (which it sounds like) then that's readily available .I was 
at VMWorld and they were very noncommittal on timeframe for multi-processor 
support.

John W. Cook
Systems Administrator
Partnership For Strong Families
315 SE 2nd Ave
Gainesville, Fl 32601
Office (352) 393-2741 x320
Cell     (352) 215-6944
Fax     (352) 393-2746
MCSE, MCTS, MCP+I, A+, N+, VSP4, VTSP4

From: Michael B. Smith [mailto:mich...@smithcons.com]
Sent: Tuesday, September 07, 2010 1:23 PM
To: MS-Exchange Admin Issues
Subject: RE: Exchange 2010 on vSphere - Redundancy?

Not supported.

You choose a particular HA technology to use and stick with it.

Regards,

Michael B. Smith
Consultant and Exchange MVP
http://TheEssentialExchange.com

From: Paul Hutchings [mailto:paul.hutchi...@mira.co.uk]
Sent: Tuesday, September 07, 2010 1:20 PM
To: MS-Exchange Admin Issues
Subject: Exchange 2010 on vSphere - Redundancy?

We're currently using Exchange 2003 but should be going to 2010 in the next few 
months.

In terms of performance, a single server should do the job, so that leaves 
redundancy.

I'm interested in peoples experiences of things like vSphere Fault Tolerance 
combined with things like DAG groups?

Ultimately we're not a 24/7/365 operation but within sensible limits I want to 
make our email system as robust as I can.

Thanks.
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