Single-Esm Configuration; Dual-Esm Configuration - IBM DS3500 Installation, User's, And Maintenance Manual

Single-ESM configuration

The DS3500 storage controller supports more than one EXP3500 storage enclosure per drive expansion
port. You can connect two or more EXP3500 storage enclosures by chaining them together. To connect a
controller to one or more EXP3500 storage enclosures that have one ESM each, complete the following
steps:
1. Connect one EXP3500 storage enclosure to the controller:
a. Connect one end of a SAS cable to the drive expansion port on the controller.
b. Connect the other end to one of the In (↑) SAS connectors on the ESM in the EXP3500 storage
enclosure.
2. Connect a second EXP3500 storage enclosure to the first EXP3500 storage enclosure:
a. Connect one end of a SAS cable to the Out (↓) SAS connector on the ESM of the EXP3500 storage
enclosure that you just connected.
b. Connect the other end of the SAS cable to one of the In (↑) SAS connectors on the ESM on the
next EXP3500 storage enclosure.
c. Repeat steps 2a and 2b for each EXP3500 storage enclosure that you add.

Dual-ESM configuration

The EXP3500 storage enclosure comes with one ESM. If your DS3500 storage subsystem is a dual
controller configuration, it supports redundant drive paths. You must install a second ESM. See
"Installing an additional ESM" on page 5-37 before attaching any EXP3500 storage enclosures.
Dual-ESM configuration with a single EXP3500 storage enclosure:
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System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide