Increase HD Space

Hello all.
I have an xserve that has 2 hard drives in it that are mirrored. They are 80GB. I would like to get new hard drives to increase my space. Does anyone have any thoughts on how I can do this on a live mail server? Can I simply unplug one of the 80GB's and put in a bigger drive, allow the data to copy over, and then replace the second 80GB drive?
Does that make sense? Let me know your thoughts.

Before you attempt to upgrade the drives in the server you should make sure that the drives you chose will work in the Apple Drive Modules (ADMs) of the server. Storage specifications for XServes are usually limited to what Apple has published for the particular model of server +and its attached storage type+. Forums are full of requests for assistance in situations where individuals are attempting to use non-Apple drives that exceed those published storage specifications with less than satisfactory results.
The choice of drive is also a major consideration when trying to use non-Apple branded drives in a server situation. Using desktop class drives or bulk-OEM drives in a server situation is a sure path to failure within a very short timeframe. When selecting drives you should select those that are 'Enterprise' class, qualified for server use, and fall within the limitations of the published capacities and types. You should purchase one of the drives you wish to use and test it in your server to insure that it will work with the ADMs that you have in your server.
Once you have selected and tested your drives you should boot the server from an external Firewire drive or the installer DVD and make a clone or diskimage of the drive. You can clone the drive to one of the new drives if you place it in an external enclosure. Just remember to partition the drive with Disk Utility.app so that it will work with the server architecture that you have. For Intel XServes, you will be partitioning the drive as 'GUID'. For PPC hardware you will be partitioning as 'Apple Partition Map' (APM).
Once you have cloned the boot drive to the new disk, place it in the ADM, insert it in the server, and boot the server from the installer DVD. Click past the first screen and select 'Terminal' from the utility menu. Then do:
diskutil list
It should return something like this with one disk installed:
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUIDpartitionscheme                        *93.2 Gi    disk0
   1:                        EFI                         200.0 Mi   disk0s1
   2:                  Apple_HFS Server HD               92.8 Gi    disk0s2
the 'size' will be different for a larger drive. Then enter:
diskutil enableRAID mirror disk0
That will enable RAID on the volume in a 'broken' configuration. Once that is done, shutdown the server, insert the other ADM and reboot.
When the server comes backup, open Disk Utility, select the 'RAID' tab, name the set, and drag the two drives into the window. DU will detect the RAID status and start the rebuild in the background. Depending on the amount of data on the drive, it could take anywhere from an hour or more to rebuild the set. Once the rebuild is finished, open the 'Startup Disk' System Prefpane and make sure that the boot drive is selected. Reboot the server to make sure that it starts with the new configuration.
It cannot be emphasized enough that you should have a tested, working, backup of the boot drive and data or -as in your case- a working replacement drive to fall back on. Also, the new, non-Apple branded, drives that you install will not be covered by any Apple service agreement that you currently have in place.

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