I made the mistake of "assuming" that they were running at least RAID 5, but it appears you guys were right in your assumptions. I asked them how they would ensure we don't have a repeat adventure and here is what I got yesterday:
Sure sounds like basic mirroring to me.Both drives are sync'd at this time so replacing the drive will not cause that issue and data will remain intact.
I will be running an entire backup between 7pm-8pm EST tonight, so the server may be a little slow right before the downtime.