Upgrading A Single-Controller To A Dual-Controller When There Is No Attached Exp3500 Enclosure; 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 & Maintenance Manual

Upgrading a single-controller to a dual-controller when there is no
attached EXP3500 enclosure
If you are upgrading a single-controller DS3500 storage subsystem to a
dual-controller DS3500 storage subsystem and there are no EXP3500 expansion
enclosures attached to the DS3500 storage subsystem, see "Installing a controller"
on page 95.
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
v You purchase the SAS cables that are required to create a redundant drive
To upgrade a single-controller DS3500 storage subsystem to a dual-controller
DS3500 storage subsystem when there are EXP3500 expansion enclosures
attached to the DS3500, complete the following steps:
1. Turn off the DS3500 storage subsystem and all attached EXP3500 expansion
2. Install a second RAID controller in the DS3500 storage subsystem by using the
3. Install a second ESM in each EXP3500 that is connected to the DS3500
4. Using the information provided in "DS3500 storage subsystem drive cabling

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 48).
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System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide
expansion enclosure that is attached to the DS3500 storage subsystem. You
install the second ESM during this procedure.
enclosure path.
enclosures.
instructions in "Installing a controller" on page 95.
storage subsystem:
a. Read the safety information that begins on page xiii and "Best practices
guidelines" on page 5.
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.
topologies" on page 42, use SAS cables to create a redundant drive-channel
path from the DS3500 RAID controllers to the EXP3500 ESMs.