Frames - IBM RS/6000 SP Handbook

The Clustered Enterprise Server (CES) is an ^ pSeries or an RS/6000
Enterprise Server, supported to be configured to operate with a Clustered
^ pSeries system (CES system).
All the possible SP-attached servers to an SP system, can be defined as
Clustered Enterprise Servers. The CES system contain pSeries systems and
RS/6000 systems only, connected to the CWS.
Note: Up to 16 of the supported M/T 7017 Models and up to 32 of the
supported M/T 7026 Models, and up to 32 mixed servers in total, can be
integrated on a CES system.
Similar to an SP node, the SP-attached server and the Clustered Enterprise
Server can perform most SP processing and administration functions. However,
unlike a standard SP node, the SP-attached server and the Clustered Enterprise
Server are housed in their own frame. Thus, the SP-attached server and the
Clustered Enterprise Server have both node-like and frame-like characteristics.
Attention: These servers are compatible with the SP Switch.
For more information, refer to Chapter 2, "SP internal processor nodes" on
page 25 and Chapter 3, "SP-attached servers and Clustered Enterprise Servers"
on page 77.

1.4.2 Frames

The IBM RS/6000 SP system frames contain and provide power for processor
nodes, switches, hard disk drives and other hardware. A frame feature code
provides an empty frame with its integral power subsystem and AC power cable.
The nodes and the other components have different specific feature codes.
The frames are offered in a list of five options:
Tall (1.93 m) model frames (Model 550, Model 555)
Tall expansion frames (F/C 1550)
Short (1.25 m) model frames (Model 500)
Short expansion frames (F/C 1500)
SP switch frames (F/C 2031 for SP Switch and F/C 2032 for SP Switch2)
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Chapter 1. Introduction