User`s guide

9-21
Disk Expansion Unit
A disk expansion unit is an external device that can install up to 14 hard disk drives. (The number of hard disk drives
depends on the model.) The server containing a Disk Array Controller (SAS, EXTERNAL) can connect one or two of
these devices. For details on the number of devices connected, see the manuals provided with the Disk Array Controller
and disk expansion unit.
IMPORTANT: A disk expansion unit is provided with no hard disk drives. You need to
purchase hard disk drives separately.
An optional cable may be required to connect with a disk expansion unit. Refer to the manual coming with the disk
expansion unit for details.
After connecting the disk expansion unit, use WebBIOS or Universal RAID Utility to set the disk expansion unit in a
RAID System (RAID0, RAID1, or RAID5). For details on settings and the setting methods, refer to the manual
provided with the board.
While a disk expansion unit is set in a RAID System, you can use the "Auto Rebuild" feature of the SAS, EXTERNAL
Disk Array Controller to restore data if one of the hard disk drives installed in the disk expansion unit fails. (Replace the
failing hard disk drive while the power is on. (Hot swapping))
IMPORTANT: When the Disk Array Controller (SAS, EXTERNAL) is installed, do not
let the system enter hibernation or standby mode.