IBM DCS3860, Installation, User'S, And Maintenance Manual

Page: 31 / 204

There are no switches on the enclosure to manually set the enclosure ID. Both
controllers or ESMs have enclosure IDs that are identical under normal operating
conditions.
Figure 7 shows the seven-segment numeric display on the storage expansion
enclosure.
For more information regarding the enclosure ID, see “Enclosure ID Settings” on
page 44 or “Seven-segment numeric display LEDs” on page 68.
Power supplies
The storage expansion enclosure has two removable power supplies that provide
power to the internal components. If one power supply is turned off or
malfunctions, the other power supply maintains electrical power to the storage
expansion enclosure.
Note: To preserve the optimal airflow, do not remove a failed power supply FRU
from the DCS3860 chassis until you are ready to replace it with a new FRU.
Figure 8 on page 14 shows the power supply controls, LEDs, and connectors.
AC DC
2
1
I
O
AC DC
2
1
I
O
dcsi0054
SAS out connector SAS in connector 2 SAS in connector 1
Seven segment
display
Seven segment
display
Figure 7. Location of seven-segment numeric display on ESM
Chapter 1. Introduction
13