IBM DS8800, Introduction And Planning Manual, Page: 26 / 256

4. Expansion models contain fan sense cards to monitor fans in each frame.
5.
Each expansion model contains two primary power supplies (PPSs) to convert
the ac input into dc power. The power area contains two battery backup units
(BBUs) in the first expansion model. The second through fourth expansion
model will have no BBUs, unless the EPLD feature is installed then each of
those models will have two BBUs.
DS8700 (Models 941 and 94E)
IBM System Storage DS8700 models (Models 941 and 94E) offer higher
performance and capacity than previous models.
All DS8700 models offer the following features:
v
Dual two-way or four-way processor complex
v Up to 128 GB of processor memory (cache) on a two-way processor and up to
384 GB of processor memory (cache) on a four-way processor complex
v
Up to 16 host adapters or 64 FCPs on a Model 941 (2-way) and up to 32 host
adapters or 128 FCPs on a Model 941 (4-way)
With an optional expansion unit, 94E, the DS8700 scales as follows:
v With one Model 94E expansion unit, Model 941 (4-way) supports up to 384 disk
drives, for a maximum capacity of up to 768 TB, and up to 32 Fibre
Channel/FICON adapters.
v With two Model 94E expansion units, Model 941 (4-way) supports up to 640
disk drives, for a maximum capacity of up to 1,280 TB, and up to 32 Fibre
Channel/FICON adapters.
v
With three Model 94E expansion units, Model 941 (4-way) supports up to 896
disk drives, for a maximum capacity of up to 1,792 TB, and up to 32 Fibre
Channel/FICON adapters.
v With four Model 94E expansion units, Model 941 (4-way) supports up to 1,024
disk drives, for a maximum capacity of up to 2,048 TB, and up to 32 Fibre
Channel/FICON adapters.
Figure 3 on page 5 shows the configuration of a Model 941 with two 94E
expansion models.
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Introduction and Planning Guide