Chapter 2 System overview
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The rear panel area provides you access to modules designed for power, thermal cooling, and host
connectivity.
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Item Description
Function
1
Controller module (CM)
Provides data redundancy and is the nerve center of the storage enclosure
2
CM release latch
Provides full contact with midplane or releases CM for inspection and service
3
CM release latch and handle
4
Fan cooling module (FCM)
Provides redundant regulation of temperature and airflow
5
FCM release latch
Provides full contact with midplane or releases FCM for inspection and service
6
FCM pull handle
7
Power supply unit (PSU)
Provides redundant regulation of power
8
PSU release latch
Provides full contact with midplane or releases PSU for inspection and service
9
PSU pull handle
10
PSU power switch
Powers on or off the storage enclosure
Figure 4 5U84 rear panel area
Two sliding drawers hold DDICs and their related sideplanes.
l
Two drawers each can contain 42 DDICs. Drawer slides lock the drawer in the fully open service position,
so require release latch activation to close the drawer.
l
DDICs slide into 42 slots in each drawer. The upper drawer, Drawer 1, contains slots logically numbered
from 0 to 41 in rows moving from top to bottom, then from left to right. The lower drawer, Drawer 2, contains
slots logically numbered from 42 to 83, following the same pattern.
