IBM TotalStorage DS300 Hardware Installation And User's Manual page 60

Figure 38. Connecting two EXP400 expansion units to a DS400 dual-controller storage
subsystem
3. Remove the hard disk drive filler panels on the EXP400 and install the hard disk
4. Connect the power cord to the expansion unit and turn on the expansion unit.
5. Use the ServeRAID Manager program to check the status of the new hard disk
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Hardware Installation and User's Guide
Channel 3
Fibre Channel RAID
drives.
The storage subsystem detects the new hard disk drives.
drives, correct any errors found, and configure the new hard disk drives.
Channel 3
controllers
Channel 4
D 400 S
EXP400
EXP400