RAID drive is listed as "failed" in disk utility - how to fix it ?

hello all. I set up a RAID with two LaCie 250GB drives about two months ago and have been using it to handle my itunes library and some back up files. It was working fine but launched disk utility the other day i looked at the mirrored raid and it said it was "degraded" and that one of the drives has failed. The first question is how do i fix the situation - do i need to "rebuild" the drive through disk utility ? and if so will i loose info or since it is mirrored, the other drive will simply overwrite it with the redundant information ? I was just intimidated by the warning after clicking the rebuild button...that my drive will be wiped. I have looked and some suggest I restart, plug unplug the firewire, etc and i have doen all of that.
Any help would be great.
thanks
-peter

See Disk Utility->Help->Disk Utility Help->A disk in a RAID set has failed or is missing.

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