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Exchange VM for 75 users?

I'm researching a 75 user Exchange 2010 SP1 build.  This will be virtualized, as our VMware servers are currently averaging about a 8% load.  I'm trying to use the Exchange 2010 Mailbox Server Role Requirements Calculator, but it seems my requirements are so meager that most of the results are left blank even after I fill in as much data as I can.  So, I turn to you!

I've not used Exchange since 2003 - at that time, with the same 75 users, virtualizing was no problem at all.  The VM ran at about 5% utilization with only 2GB RAM and 1 vCPU.  I see that 2010 has added a number of new roles, all of which can run on the same VM, but how much extra overhead does that imply?

Our users will not be sending many images or large attachments, but we have 1 9GB mailbox, 1 5GB mailbox, and the rest are mostly 500MB mailboxes.  The vSphere host is 8 core 2.6 55xx series, with 16x2.5" 15K SAS in a RAID 10.  It has 10 VMs currently, but I could migrate 4-5 of those to a different host if necessary.

A few specific question that I have:

Should I break up the roles and separate them on to our 2 hosts (we only have 2, equal in hardware)?

Is there any point to creating multiple VMDKs since they all reside on the same physical LUN?  I've read that you can run the risk of filling partitions with logs and IS, which would crash the box entirely, and that's the main reason to do so.

The calculator recommends 8GB RAM and 2 databases but only 1 CPU?  could that be accurate for such a small user base?

We will be doing weekday full backups with BackupExec which should commit/flush logs.

Thanks!
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sbumpas
Asked:
sbumpas
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1 Solution
 
Shabarinath RamadasanInfrastructure ArchitectCommented:
Check out this best practice guide from VMWare on hosting E2k10 on a VMWare Platform.

I dont see much use if you split up the roles and as the load is minimal.

Goodluck
Shaba
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sbumpasAuthor Commented:
I did already read the best practice guide from VMware - that white paper is geared toward a larger deployment.  Unfortunately, every article/manual I come across seems to assume you have 3000 users - that's why I posted here instead.  

Information on smaller deployments is hard to come by - anybody have firsthand experience?
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Shabarinath RamadasanInfrastructure ArchitectCommented:
As long as the load is minimal, You shouldn't be worried on a performance aspect.
If you have enough servers, you may think of building High availability for Mailboxes using DAG - Which will require two set of servers.

I would recommend to go-ahead and build it if you don't see any chance of user count increase in the near future.

Good luck
Shaba
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sbumpasAuthor Commented:
Thanks - I will give it a try!
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