Lion Server Partitioning Recommendations

I am getting ready to upgrade my Mini Server to Lion Server via clean install. My main use of my server is web server and NFS share for storing files on my network (Linux and OSX machines). I am also considering using as a mail server too.

I recently started partitioning my Lion client machines to move /Users to a separate partition thus leaving my OS on its own partition. I prefer having my OS on a separate partition for ease of maintenance. I followed Lnx2Mac’s blog of “Moving OSX /Users to a separate partition.” (the forum would not allow me to post a hyperlink as the reference)

My Mini server has the standard dual 500GB hard drives. Can anyone offer a recommendation on how I should partition the drives so that I have Lion Server on a separate partition? This way I can make a back up DMG of the OS before performing future updates and will have a fail safe to roll back to without affecting my data ( web server files and NFS share).

Should I split each 500GB partition in half? For example, on the first hard drive split into 2 partitions with OS on first partition and leave second partition for misc storage. Then on second hard drive also split into two partitions with /Users on one partition and web server files on second partition. I would then edit /etc/fstab accordingly.

I am just looking for some best practices to make my Lion Server maintenance as efficient as possible. Thanks!!