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IBM System Storage DS3500: Introduction and Implementation Guide
Figure 4-5 shows the port layout on the rear of an EXP3500 enclosure with two ESMs
installed.
Figure 4-5 The rear panel of an EXP3500 enclosure with dual ESMs installed.
From the left, the below ports available on every ESM:
Two SAS expansion ports labelled 1 and 2. These two ports are each a x4 multilane, 6
Gbps universal mini-SAS port. They are both IN ports but only one may be used at any
time. Trunking is not supported on these ports.
A Serial port reserved for use by IBM Service personnel only.
An Ethernet port reserved for use by IBM Service personnel only.
A SAS expansion port. This port is for connecting to other EXP3500 enclosures only and
is a x4 multilane, 6 Gbps universal mini-SAS port.
Below SAS ports 1 and 2 there is a 7-segment numeric LED display that provides information
about enclosure identification and diagnostics. The functions of this and the other status
LEDs located on the rear panel will be described in more detail in the Chapter 14,
“Administration - Support” on page 337.
4.2 Enclosure ID settings
The enclosure ID is a unique two-digit identifier for each DS3500 and EXP3500 enclosure in
the storage subsystem configuration. In a dual controller DS3400 subsystem, both controllers
should have the same enclosure ID. Similarly, on an EXP3000 with two ESMs, both ESMs
must have the same enclosure ID under normal operating conditions.
The default enclosure ID of the DS3500 controller is 85, and best practise is to leave this
value unchanged. The enclosure ID of each EXP3500 is normally set to a value of 00 at the
factory. The DS3500 controller firmware will automatically assign a unique enclosure ID to
each EXP3500 enclosure that you connect to it. The automatically assigned EXP3500
enclosure IDs will begin with enclosure ID 0, then 1, 2 and so on. The range of supported
enclosure ID values is 0 through 99.
You can view and change the enclosure IDs through the DS Storage Manager software. See
“Enclosure ID” on page 208
for information about how to change the enclosure ID.
In normal operation, the enclosure ID is also displayed on the seven-segment numeric LED
display located on the back of each controller and ESM. Figure 4-6 on page 93 shows the 7
segment numeric LED displaying the enclosure ID.
Note: If you are attaching the EXP3500 to a dual controller DS3500 storage subsystem,
you must install a second ESM in the EXP3500 expansion enclosure to provide a
redundant drive path to the DS3500 storage subsystem.
Summary of Contents for DS3500
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