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18 High Availability Software for the Intel
®
NetStructure
TM
ZT 4901 Technical Product Specification
Introduction
2.3 High-Availability Software Approach
As shown in the Figure 1, “High-Availability CPU Architecture” on page 11, there are three High-
Availability software components:
• Host application
• System Management
• Backplane Device Drivers
2.3.1 Host Application
The host application serves as the central control mechanism for the platform. For a host
application to function in an RH environment it must be able to relinquish or receive control of the
system in a controlled manner. Dynamically transitioning of bus segment ownership between
active and backup requires the application to maintain data synchronization between the
applications on the redundant Hosts.
Figure 4. High-Availability System Backplane Architecture
2 21
3 4 5 6 7 8 13 14 18 19 20
15 16 17
1A
1B
Host Processor Board
Redundant Host Processor Board
Bridge Mezzanine Board
Bridge Mezzanine Board