Vsphere 5 SAN / storage group design

I have to setup a HP P2000 G3 SAN with 12 x 300GB SAS drives for 2 ESXi servers
There will only be max around 12 VM's. They will include 2 x SQL & 1 x exchange 2010 VM's
The site has approx 50 users

Can any on advise me on how to setup the storage & why?

Please can you include the SAN vdisk/RAID, SAN  volume & vsphere datastore levels.

Thanks

esitrepxeAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Create a RAID 10 vdisk with all the 12 x 300 SAS drives, RAID 10 performs fastest for read and write performance. More disks = more spindles = more performance = more IOPS in the VDISK.

Once you have created your vdisk, I would then create three LUNs (600GB each) and present these LUNs to vSphere servers, which will be formatted as VMFS.

It depends on how much stortage you require, and the trade off between RAID 5 and RAID 10.
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Paul SolovyovskySenior IT AdvisorCommented:
With SAS drives I've configured RAID 5 with at least a hot spare on this hardware. Unless your SQL is IOPS intensive it will do and Exchange can run on SATA drives per MS white papers.  

In vSphere make sure to enable round robin and MPIO on the vmkernel ports so you get use multiple paths' and get and have at least 2 switches if using iSCSI.

Make your vDisks around 500 to 600GB as hanccocka stated but depending on the size of your Exchange Server and SQL Servers it may make sense to create a separate Datastore for large Virtual Machines as it gives you a bit more flexability when if using Business Copy or Continuous Access (snapshots and replication) as this is done per LUN.
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