Toshiba Magnia 3030 - Manual (Page 109)

Installing and Removing Hardware
Hard Disk Drive (HDD)
91
8 Recover (rebuild) the disk array if the RAID controller is installed.
See the Instruction Manual of a RAID controller
NOTE: If the server uses a RAID controller for redundancy, the operation is
continued by a spare device without stopping the system even if one of the
hard disk drives that configure a disk array fails (downgraded operation).
However, if another device fails, it may destroy and lose important programs
or data. Replace the faulty device by a normal one as quickly as possible and
recover the disk array.