DS8800 (Models 951 and 95E)
The DS8800 offers higher performance and capacity than previous models in the
DS8000 series. DS8800 includes Model 951 (base model) and Model 95E (expansion
model).
Model 951 (base model)
Figure 4 on page 8 provides a high-level view of the front and back of the Model
951 base, which includes the new high-density storage enclosures 1 that support
24 drives in a 2U (height) form factor. The Model 951 is offered with a 2-way and a
4-way processor complex.
The back of the model contains the power supplies to the storage enclosures and
the FCIC cards 1 (FCIC cards on top, power supplies on the bottom).
The POWER6+ servers 2 contain the processor and memory that drive all
functions within the DS8800.
The base model also provides I/O enclosures 3, power supplies and cooling, and
space for up to 15 disk drive sets (16 drives per disk drive set). In a maximum
configuration, the base model can hold 240 disk drives (15 disk drive sets x 16
drives = 240 disk drives).
The I/O enclosures provide connectivity between the adapters and the processors.
The adapters contained in the I/O enclosures can be either device adapters (DAs)
or host adapters (HAs). The communication path used for adapter-to-processor
complex communication in the DS8800 consists of four, 8 lane (x8) PCI-e
Generation 2 connections.
The power area contains two battery backup units (BBUs) 4. This is true whether
it is a 2-way or 4-way system or whether you purchased the optional Extended
Power Line Disturbance (EPLD) feature (feature 1055) or not. (The BBUs help
protect data in the event of a loss of external power.)
The primary power supplies (PPSs) 5 are on the side of the model. They provide
a redundant 208 V dc power distribution to the rack to convert the ac input into dc
power. The processor nodes, I/O drawers, and storage enclosures have dual power
supplies that are connected to the rack power distribution units 6. The power
and cooling are integrated into the storage enclosure.
Chapter 1. Introduction to IBM System Storage DS8000 series 7
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