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106 DS8000 Series: Concepts and Architecture
The DS8100 Model 921 can connect to one expansion frame. This expansion frame is called
a Model 92E. Figure 6-2 on page 105 displays the front view of a DS8100 Model 921with the
cover off, and the Model 921 with an expansion Model 92E with covers. The base and
expansion frame together allow for a maximum capacity for a DS8100 with 384 DDMs. There
are 128 DDMs in the base frame and 256 DDMs in the expansion frame. With all DDMs being
300 GB, this results in a maximum disk storage capacity of 115.2 TB.
Figure 6-3 shows the maximum configuration of a Model 921 with the 921 base frame plus a
92E expansion frame and provides the front view of the basic structure and placement of the
hardware components within both frames.
Figure 6-3 Maximum configuration for the Model 921
6.1.3 DS8300 Models 922 and 9A2
The DS8300 Model 922 and 9A2 offer higher capacity and performance than the DS8100.
Model 9A2 provides two storage images through two storage system LPARs within the same
physical storage unit. Both storage images split the processor, cache, and adapter resources.
The split ratio in the beginning is a 50:50 split with the potential to subdivide these resources
later at a different split ratio between the storage images. This future flexibility is going to also
allow a finer granularity to split the processor resources than on an entire processor level,
which is the case for the first editions of the Model 9A2.
Note: A Model 921 can be upgraded to a Model 922 or to a Model 9A2.