System Control Structure (Scs) - IBM Power 595 Technical Overview And Introduction

Figure 2-6 CEC midplane
Table 2-2 lists the CEC midplane component locations codes.
Table 2-2 CEC location codes
Location code
n
U -P1
n
U -P1-C1
n
U -P1-C2
n
U -P1-C3
n
U -P1-C4
n
U -P1-C5

2.1.4 System control structure (SCS)

The Power 595 has the ability to run multiple different operating systems on a single server.
Therefore, a single instance of an operating system is no longer in full control of the
underlying hardware. As a result, a system control task running on an operating system that
does not have exclusive control of the server hardware can no longer perform operations that
were previously possible. For example, what would happen if a control task, in the course of
recovering from an I/O error, were to decide to reset the disk subsystem? Data integrity might
no longer be guaranteed for applications running on another operating system on the same
hardware.
As a solution, system-control operations for large systems must be moved away from the
resident operating systems and be integrated into the server at levels where full control over
the server remains possible. System control is therefore increasingly delegated to a set of
other helpers in the system outside the scope of the operating systems. This method of host
operating system-independent system management is often referred to as
control
, or out-of-band system management.
Top View Top View Top View Top View
Processor Book Processor Book Processor Book Processor Book
Connectors (4x) Connectors (4x) Connectors (4x) Connectors (4x)
Oscillator OSC Oscillator OSC Oscillator OSC
cards (2x) cards (2x) cards (2x)
System controller System controller System controller System controller
cards (2x) cards (2x) cards (2x) cards (2x)
Oscillators (OSC) cards Oscillators (OSC) cards
SC = System Controller
Component
CEC Midplane
System VPD anchor card
CEC System Controller SC card 0
CEC Oscillator card 0
CEC Oscillator card 1
System Controller SC card 1
Bottom View Bottom View Bottom View
Processor Book Processor Book Processor Book
Connectors (4x) Connectors (4x) Connectors (4x)
CEC VPD CEC VPD CEC VPD
Card Card Card
Chapter 2. Architectural and technical overview
System VPD System VPD System VPD
SmartChip SmartChip SmartChip
Card Card Card
out-of-band
43