A- You do not need to do this offline. The drives can be hot plugged in, then with the ACU software in Windows, do a rescan, you should find the two new drives. Add them to the RAID5 array. This is all done on-line, you will only get a little bit of a server slow down, nut much. When the RAID 5 is done, extend the logical drive, then from windows Disk Management, do a rescan. Now use DISKPART to extend the file-system
http://support.microsoft.com/kb/325590and your done, without even taking down the server...