IBM DS3500 Installation, User & Maintenance Manual page 59

a. Connect one end of a SAS cable to RAID controller A.
b. Connect the other end of the SAS cable to one of the In (↑) SAS connectors
on the left ESM in the EXP3500 expansion enclosure.
2. Connect the EXP3500 expansion enclosure to RAID controller B:
a. Connect one end of a SAS cable to RAID controller B.
b. Connect the other end of the SAS cable to one of the In (↑) SAS connectors
on the right ESM in the EXP3500 expansion enclosure.
Dual-ESM configuration with two or more EXP3500 expansion enclosures:
The DS3500 controllers support more than one EXP3500 expansion enclosure per
physical port, so multiple EXP3500 expansion enclosures can be connected by
chaining them together.
To connect DS3500 RAID controllers A and B to multiple EXP3500 expansion
enclosures that have two ESMs each, complete the following steps:
1. Connect one EXP3500 expansion enclosure to RAID controller A:
a. Connect one end of a SAS cable to the drive expansion port on the DS3500
RAID controller A.
b. Connect the other end of the SAS cable to one of the In (↑) SAS connectors
on the left ESM in the EXP3500 expansion enclosure.
2. Connect the left ESM of the EXP3500 expansion enclosure to the next
EXP3500 expansion enclosure in the chain:
a. Connect one end of a SAS cable to the Out (↓) SAS connector on the left
ESM of the EXP3500 expansion enclosure that you just connected.
b. Connect the other end of the SAS cable to one of the In (↑) SAS connectors
on the left ESM in the next EXP3500 expansion enclosure in the chain.
c. Repeat steps 2a and 2b for each EXP3500 expansion enclosure that you
add.
3. Connect the last EXP3500 expansion enclosure in the chain to RAID controller
B:
a. Connect one end of a SAS cable to the drive expansion port on the DS3500
RAID controller B.
Chapter 3. Cabling the storage subsystem and expansion enclosure
39