Well ive upgraded 2 snap 4400's pretty much the same as the 4500 as per Snap/adaptec. The problem ive run into is gaining full use of the new drive space.
One snap 4400 came stock with 120 gig drives i uped it to 200 gig drives but it formatted them as 169 gigs total which is incorrect.
To upgrade the server you must have 1 original drive in the first slot. The machine WILL NOT boot up with a new fresh drive in it, The Guardian OS is installed on the drive.
I would reccomend purchasing 1 new drive first to see if you can even see the full capacity of the drive. Chances are it will format the drive to the size of the original one
How old is the unit? It should handle 400 gig drives fine (no power issues or hardware issues) as it ships now with 4 400 gig drives.
If your in warantee you might want to call adaptec and tell them youve lost 2 drives in the array and just happen to have new drives laying around. and see if they can help reclaim the full use of the discs.
Does any one know if there is a way to adjust partition sizes in linux? You can get to a command prompt on these devices via the serial port.