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comprise the enclosure ID are referred to as x10 and x1 digits. The enclosure ID
provides a unique identifier for each enclosure in the storage subsystem. The
storage management software automatically sets the enclosure ID number. You can
only change the enclosure ID setting through the DS4000 storage management
software. There are no switches on the DS4700 Express chassis to manually set
the enclosure ID. Both controller enclosure ID numbers will be identical under
normal operating conditions. The enclosure ID is set to a value of 85 from the
factory.
Storage expansion enclosures in a DS4000 storage subsystem must also have
unique enclosure IDs. In addition to having unique enclosure IDs for each storage
expansion enclosure (including the DS4000 storage subsystems with drives
installed) in the DS4000 storage subsystem configuration, ensure that the single
digit (x1) of the enclosure ID for every storage expansion enclosure in a redundant
drive channel/loop pair is unique.
If you do not set the single digit value of the enclosure IDs to be unique among
storage expansion enclosures (including the DS4000 storage subsystem with drives
installed) in a redundant drive channel/loop pair, then drive loop errors might be
randomly posted in the DS4000 subsystem Major Event Log (MEL) when you
intermix different types of storage expansion enclosures in a redundant drive loop
pair (such as an EXP100 with an EXP810). For example, with four enclosures
attached to a DS4500 in a redundant drive loop pair, the correct enclosure ID
settings should be x1, x2, x3, and x4 (where x can be any digits that can be set).
Examples of incorrect settings would be 11, 21, 31, 41; or 12, 22, 32 62. These
examples are incorrect because the x1 digits are the same in all enclosure IDs
(either 1 or 2).
If the enclosure IDs in your DS4000 subsystem configuration are not currently set to
have unique single digit (x1) values for the enclosures in the same redundant drive
channel/loop pair, make the changes to the enclosure IDs in the next maintenance
schedule if you have storage expansion enclosures with mechanical switches such
as EXP710s in the DS4000 configuration. This will prevent unnecessary downtime
when you add enclosures of different types (especially EXP810s) to the existing
enclosures in the redundant drive channel/loop pair. Storage expansion enclosures
and DS4000 storage subsystems with mechanical enclosure ID switches require
that you power cycle the configurations to activate the new enclosure ID settings.
The EXP810 storage expansion enclosures do not required you to power cycle the
DS4000 configuration to activate new enclosure ID settings.
Figure 2 on page 10 shows the controllers for DS4700 Express model 70. Figure 3
on page 10 shows the controllers for DS4700 Express model 72.
Chapter 1. Introduction 9