The following notes provide additional information about the labeled components on
Figure 1:
1. The rack power area of the base models provides redundant power supplies
(two primary power supplies), power control cards, and backup battery
assemblies to help protect data in the event of a loss of external power. Model
921 contains two batteries. Model 922 and Model 9A2 contain three batteries to
support the 4-way processors.
2. All base models allow up to eight disk enclosures, which contain the disk drives.
In a maximum configuration, each base model can hold up to 128 disk drives.
3. All base models contain one Management Console (MC), a keyboard, and
display. The Management Console is the focal point for configuration, copy
services management, and maintenance activities.
4. All base models contain two processor enclosures. The processor enclosures
contain the computer electronic complex (CEC). The Model 921 processor
enclosures have 2-way processors. Processor enclosures on the Model 922 and
Model 9A2 have 4-way processors.
5. All base models contain I/O enclosures and adapters. The I/O enclosures hold
the adapters and provide connectivity between the adapters and the processors.
Both device adapters and host adapters are installed in the I/O enclosure.
Figure
2 on page 3 provides a high-level view at the components for the expansion
models (Models 92E and 9AE).
1vxc4x
Disk Enclosures and
Disk Drive Sets
Management Console,
Keyboard and Display
Processor
Enclosures
I/O Enclosures
and Adaptors
Rack Power
1
2
3
4
5
Figure 1. A base model (with front cover off) and its main components
2 DS8000 User’s Guide
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