change the enclosure ID setting through the DS4000 storage management
software. There are no switches on the EXP810 chassis to manually set the
enclosure ID. Both ESM enclosure ID numbers will be identical under normal
operating conditions.
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 or DS4000 storage subsystems
with mechanical switches such as EXP100s, EXP710s or DS4300 storage
subsystems in the DS4000 configuration. This will prevent unnecessary downtime
when you add enclosures of different types 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 require you to power cycle the DS4000
configuration to activate new enclosure ID settings.
Figure 2 shows the rear view of the ESMs and power supply fan units for models
81A and 81H. Figure 3 on page 7 shows the rear view of the ESMs and dc power
supply fan units for model 81S and 81T.
2
3
4
6
1
7
5
5
6
4
3
2
1
7
exp81023
Figure
2.
Back
view;
power
switch,
enclosure
ID,
and
connectors
6
IBM System Storage DS4000 EXP810 Storage Expansion Enclosure: Installation, User’s and Maintenance Guide
Summary of Contents for DS4000 EXP810
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