IBM Partner Pavilion DS4100 - Manual (Page 91)

3. Remove the blank filler trays and insert drive trays. Connect power to the drive
expansion unit first and then connect power to the DS4100. After the storage
server is powered on, the storage server locates the new drives.
4. Use the DS4000 Storage Manager client to check the status of the new drives,
correct any errors found, and configure the new drives.
For more detailed information about how to cable the storage server and expansion
units, see the DS4100 Fibre Channel Cabling Instructions that come with the
storage server.
DS4000 EXP100 loop redundancy (DS4100 base storage server only)
The DS4000 EXP100 provides redundant loop support when the second ESM is
configured, and when both loops (called A and B) are connected to a DS4100
storage server model that supports redundant loops. (The DS4100 base storage
server supports redundant loops; the DS4100 single-controller storage server does
not support redundant loops.) If a cable or SFP module fails on drive loop A, drive
loop B provides redundancy, which is an alternate path to your disk drives.
Figure 54 on page 60 shows a redundant loop that you might create with a DS4100
and three DS4000 EXP100s. The numbers provided in Figure 54 on page 60 show
the order in which cables should be attached.
In port Out port
New expansion unit
Storage server with
two RAID controllers
Left ESM board Right ESM board
f10ug031
Figure 53. Adding an expansion unit
Chapter 3. Cabling the storage server 59