Overview Of Steps To Connect Expansion Enclosures To A Storage Subsystem; Example Of A Redundant Drive Path - IBM DS3500 Installation, User & Maintenance Manual

Figure 35 shows an example of a redundant drive-channel pair. If any component of
the drive channel fails, the RAID controllers can still access the expansion
enclosures in the redundant drive-channel pair.
Note: In expansion enclosures that are connected to a dual-controller storage
subsystem, you must install the optional second ESM to support dual
redundant drive paths.
Figure 35. Example of a redundant drive path
Overview of steps to connect expansion enclosures to a storage
subsystem
To connect expansion enclosures to the storage subsystem, complete the following
steps:
1. Follow the instructions in the IBM System Storage DS3500 and EXP3500 Rack
Installation and Quick Start Guide for your expansion enclosure and the rack
installation instructions to set up and mount the expansion enclosures.
2. Select a cabling topology applicable to the number of ESMs in the expansion
enclosures that you will connect to the DS3500. "DS3500 storage subsystem
drive cabling topologies" on page 42 describes the recommended schemes for
cabling expansion enclosures with one ESM or two ESMs to the DS3500 and to
each other (if you are connecting more than one expansion enclosure).
3. Follow the cabling diagram for your chosen topology.
4. If required, set unique enclosure IDs for all expansion enclosures that are
cabled to the DS3500. See the DS Storage Manager 10 Installation and Host
Support Guide for information about setting the enclosure ID.
The DS3500 storage subsystem locates the drives in the expansion enclosures
after you power-on the configuration. Always turn on the expansion enclosures first
and then turn on the DS3500. After you have powered-on the configuration, use the
DS Storage Manager software to check the status of the new drives, correct any
errors, and configure the new drives.
Chapter 3. Cabling the storage subsystem and expansion enclosure
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