You can't create a RAID 1 with two disks, then a RAID 0 with the available space on a second disk.  If you have a RAID 1 across the disks, any additional RAID arrays you configure across those same disks can ONLY be RAID 1.  So, it is likely that because you can't create a VD with space on one disk, it will not show it as available (because it's not available for anything).
I have a PE 1950 with 2 SAS 73 GB drives configured as one virtual disk. I need to replace those drives due to age and increase the drive space on the server. I have 2 new 300 GB SAS drives. My thought is to do the following: In Open Manager Server Administrator, take drive 1 off line then remove it. Replace it with one of the new 300 GB drives.Let rebuild the array.Once rebuilt, take drive 0 off line and remove it.Replace it with the other new 300 GB drive.Let it rebuild the array. Once that is complete, use Open Manage Server Administrator to create a new virtual disk from the free space of both drives, a new Raid1 virtual disk. Right now, I have replaced the first drive and it has rebuilt the array. However, before replacing the second drive, I check the drive status in Server Manager and it is showing capacity of 278 GB (correct) and used RAID space of 68 GB (correct) but available RAID space of 0 ZERO GB. That is my concern. Is that just becuase there are currently no other drives with free space? I tried using the new virtual disk wizard and it shows an error no drives available.   [IMAGE]
Replace SAS drives PE 1950 with Perc 5i