We are looking to migrate our Exchange 2003 server to Exchange 2010. I am planning on getting 2 servers and a SAN to run Exchange 2010 (plus possibly move our BES and a couple of other servers to a virtualised environment depending on the performance I am getting out of the setup).
My question is about disk configuration. I know that if I was doing this in a physical setup I would be looking at somthing like the following to get optimum performance.
Mirrored OS Array
Mirrored Page File Array
Mirrored SMTP Array
Mirrored Log Files Array
Raid 0+1 Database Array
Given that the virtual machines probably will be sat on the SAN in a RAID 5 array am I better to do the following:
Create Seperate Virtual Disks for each of the components (OS, Page File, Logs, SMTP and Databases) and place them all onto the SAN.
Make sure the Physical Hosts have enough mirrored disks, create Seperate Virtual Disks for each of the components (OS, Page File, Logs, SMTP and Databases) and put the various components onto the dedicated mirrors with the databases going on the SAN.
Do the same performance rules apply for virtualised disks as physical disks for Exchange 2010? I suspect yes but I'm not sure. If not should I just create one massive virtual disk for everything and put it on the SAN?
I have not fully decided between Hyper-V or VM-Ware yet but I am leaning towards VMWare. Also if it helps we will be employing DAGs in the Exchange 2010 setup so there will be 2 Exchange servers setup on the SAN with a 3rd going to an offsite location at some point but this won't happen immediately or be on the SAN we are looking at now.
Thanks in advance for any help given.