Here's the situation. Windows Server 2003 Standard, SP2. I have a pair of identical disks in a Proliant system. They have both been configured as Dynamic Disks. The System Paritition is on Disk 0, 25GB. The Data Partition is also on Disk 0, 124.04GB. Disk 1 is sitting completely unallocated, with a reported size of 149.05GB. All sizes coming from the Computer Management GUI.
Here's the problem. I can only get one of these partitions to mirror. Once one is mirrored, the "Add Mirror..." option is grayed out.
On another server, I was able to mirror both partitions, but the difference was that I created the Data Partition as a Mirrored Partition when it was formed and formatted. In my current server, the Partition was created and formatted, and now contains a bunch of data that I cannot easily trash and recreate.