I am deploying Exchange 2010 on a single server on my VMware/SAN. We have about 100 mailboxes. I will be using normal VMDK disks, so my question is about the disk design. Should I put everything on the same single VMDK? Should I make two, one for OS and one for the database/logs? Or should I make three and separate out the logs too? Should the VMDKs be on separate LUNs?