CentOS - Mar 2012 - Add. Sense: Logical unit not ready, initializing command required

Hello everyone!
What does following error mean, I am getting this in /var/log/messages 
repeatedly, this morning my server (IBM eServer x226) was unable to boot 
and when it booted its giving following errors. I have RAID 1 (Adaptec 
HOSTRAID) setup on this server. How to fix this? "fdisk -l /dev/sdb" 
does not give me any output. Yesterday I had power failure (UPS failure) 
and server shutdown abruptly.

Mar 23 12:11:53 matrix kernel: sd 3:0:0:0: Device not ready: <6>: 
Current: sense key: Not Ready
Mar 23 12:11:53 matrix kernel:     Add. Sense: Logical unit not ready, 
initializing command required
Mar 23 12:11:53 matrix kernel:
Mar 23 12:11:53 matrix kernel: end_request: I/O error, dev sdb, sector 0
Mar 23 12:11:53 matrix kernel: Buffer I/O error on device sdb, logical 
block 0
Mar 23 12:11:53 matrix kernel: Buffer I/O error on device sdb, logical 
block 1
Mar 23 12:11:53 matrix kernel: Buffer I/O error on device sdb, logical 
block 2
Mar 23 12:11:53 matrix kernel: sd 3:0:0:0: Device not ready: <6>: 
Current: sense key: Not Ready

If I run smartctl, I get following:

[root at matrix ~]# smartctl -a /dev/sdb

Device: IBM-ESXS PYH300C3-ETS10FN Version: RXQN
Serial number:         VAVH8YVA
Device type: disk
Local Time is: Fri Mar 23 12:23:53 2012 IST
*device is NOT READY (e.g. spun down, busy)*
A mandatory SMART command failed: exiting. To continue, add one or more 
'-T permissive' options.

-- 

Without Wax!

Rahul Tidke