Upgrading A Single-Controller To A Dual-Controller When There Is One Or More Exp3500 Enclosures Attached To The Storage Subsystem; Connecting Secondary Interface Cables - IBM DS3500 Installation, User's, And Maintenance Manual

Upgrading a single-controller to a dual-controller when there is one or
more EXP3500 enclosures attached to the storage subsystem
Before you upgrade the DS3500 storage subsystem from a single-controller to a dual-controller, make sure
that:
v You purchase a second environmental services module (ESM) for each EXP3500 storage enclosure that
is attached to the DS3500 storage subsystem. You install the second ESM during this procedure.
v You purchase the SAS cables that are required to create a redundant drive enclosure path.
To upgrade a single-controller DS3500 storage subsystem to a dual-controller DS3500 storage subsystem
when there are EXP3500 storage enclosures attached to the DS3500, complete the following steps:
1. Turn off the DS3500 storage subsystem and all attached EXP3500 storage enclosures.
2. Install a second controller in the DS3500 storage subsystem by using the instructions in "Installing a
controller" on page 5-3.
3. Install a second ESM in each EXP3500 that is connected to the DS3500 storage subsystem:
a. Read the safety information that begins on page "Safety" on page xi and "Best practices
guidelines" on page 1-7.
b. Remove the ESM filler panel from the rightmost ESM bay of the EXP3500:
1) On the left side of the ESM filler panel, press the orange release tab to the right just enough to
release the handle (no more than 6 mm [0.25 in.]) as you rotate the handle upward.
2) Using the handle, gently slide the ESM filler panel out of the EXP3500. Save the ESM filler
panel for future use.
c. Hold the new ESM so that the handle is fully extended.
d. Gently slide the ESM into the bay until it stops. Rotate the handle downward into the closed
position until it clicks.
4. Using the information provided in "DS3500 storage subsystem drive cabling topologies" on page 3-21,
use SAS cables to create a redundant drive-channel path from the DS3500 controllers to the EXP3500
ESMs.

Connecting secondary interface cables

This section applies to direct (out-of-band) management configurations only. If your configuration uses
host-agent (in-band) management, skip this section.
Use the Ethernet management port on the rear of the storage subsystem to connect the controllers for
direct management of the storage subsystems (see "Direct (out-of-band) management method" on page
3-27).
Important:
1. To minimize security risks, do not connect the DS3500 to a public LAN or public subnet. Use a local
private network for the DS3500 and the storage management station Ethernet connectors.
2. For proper EMI shielding, always use quality braided and shielded serial cables.
Connect an Ethernet cable from the management station to the Ethernet connector on controller A on the
rear of the storage subsystem. For a dual-controller storage subsystem, you can connect a second Ethernet
cable from the management station to the Ethernet connector on controller B. Figure 3-28 on page 3-26
shows the locations of the Ethernet management connectors on the DS3500 storage subsystem.
Chapter 3. Cabling the storage subsystem and storage enclosure
3-25