RAID5 Disk Failure - What do I do now?

I'm pretty green when it comes to RAID, but we just set one up in a brand new MacPro 2 weeks ago. I've got the Apple RAID card with a 2g drive in bay 2, a 1.5g in bay 3, and a 2g drive in bay 4. I used the Raid Utility to create a RAID5 between the three.
I had left some files converting over the weekend, and I just got into work to find a message from RAID Utility that one of the drives attached to the RAID card has failed. It looks like its the drive in Bay 2. Do I just replace it? The last message RAID Utility left under Events states "Degraded RAID set RS2 - No spare available for rebuild."
Looking to the left under Drives, it shows the 2g drive in bay 2 is roaming. I have no clue what that means. The hardware viewer lists the status of the Drive in bay 2 as
Assigned: no
Failed: no
Foreign: no
Missing: no
Reliable: Yes
Roaming: Yes
Spare: no
Any help would be much appreciated.
Aaron

"Degraded RAID set RS2 - No spare available for rebuild."
What do I do now?
Option A) you buy another drive, install it in your Mac, partition it the way you want, and add the spare drive to the RAID set, and have it rebuild your complete redundant set.
The "failed" drive may be really bad, or may have a marginal block that needs to be re-written to come clean, or somewhere in between. You should completely re-initialize it with write Zeroes over the entire surface (takes several hours). If it comes out clean, you may be able to use it as a spare or set it to work doing backups. But a drive that develops ANY Bad Blocks in the field is likely to fail within 6 months of constant use.
If you expect to continue to use RAID, most users suggest that a matched set (or nearly-matched set) of drives is the best way to go. Different sizes means different operating characteristics, and that can cause problems (less so for Mirroring than other RAIDs). For use in a RAID, NO other files should be placed in other partitions on the same drive, as any access to those other files will slow down your RAID to worse than "ordinary" speeds.
Option B) decide that this RAID setup is not for you. Copy your files off to another drive and stop using the RAID card.

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