IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 100 / 252

One DS3950 and three or more EXP395 storage expansion
enclosures
To connect three or more storage expansion enclosures to a DS3950 storage
subsystem, alternately connect a storage expansion enclosure to one of the drive
ports of the dual-ported drive channel then connect to the other port until all of
the storage expansion enclosures are attached. Figure 47 shows the cabling scheme
for one DS3950 storage subsystem and three EXP395 storage expansion enclosures
behind both ports of a dual-ported drive channel.
Perform the following steps to create the cabling scheme shown in Figure 47:
1. Connect port 1A on the left ESM in EXP395 one to port 1B on the left ESM in
EXP395 two.
2. Connect port 1A on the right ESM in EXP395 two to port 1B on the right ESM
in EXP395 one.
3.
Connect port 1B on the left ESM in EXP395 one to port 2 of drive channel 1 on
the DS3950.
1A 1B
Port 2, drive channel 1
1A 1B
1A
1B
1A
1B
Port 1, drive channel 1
Port 1, drive channel 2
Port 2, drive channel 2
1A 1B
1A 1B
EXP395 one
EXP two 395
EXP three 395
Storage
subsystem
Figure 47. One DS3950 and three EXP395 storage expansion enclosures behind a pair of
DS3950 drive ports
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IBM System Storage DS3950 Storage Subsystem: Installation, User’s, and Maintenance Guide