[CentOS] Where Did The Disk Go???

Wed Nov 27 16:21:34 UTC 2013
Gene Poole <gene.poole at macys.com>

I'm running CentOS 5.9 x86_64 on a machine I built myself that has 6 SATA 
II hard drives (4 - 1 TB drives; 2 - 1.5 TB drives) all in several RAID-1 
arrays. These arrays were created when I did the original installation 
with CentOS 5.1 and each created partition (both standard and LVM) were 
built raid 1.

Due to some things happening around the house that required most of my 
attention, I saw some alerts concerning drive /dev/sdb but I didn't have 
time to address it and since I am running raid 1...  One of the tings that 
happened was my home took a lightening strike and we were down for 4 days.

When we got our electricity back and I brought the machine back up I 
noticed that there were only 5 drives listed  and I wasn't getting any 
more alerts.  What was /dev/sdb was no longer listed with any command 
(fdisk; cat /proc/mdstat; mdadm --list).

I do have a spare drive and my questions are:

Anyone know how I can find the serial number of the bad drive?
Once replaced, what is the best way to get the partitions recreated?
Gene Poole