Chapter 2 System Architecture
CPX8216 and CPX8216T Installation and Use (6806800A52C)
11
The active/active configuration is illustrated in the following figure.
Note H.110 traffic and HA Linux do not support a load-sharing configuration.
I/O Configurations
The CPX8216 contains two independent 8-slot CompactPCI buses. One slot in each bus is
dedicated to a system processor, and another is needed for the HSC. This leaves six slots on
each bus to support I/O devices or nonsystem processors.
One possible configuration is to use the CPX8216 as a high I/O CompactPCI system with
redundant CPUs. With this configuration, it is possible to run twelve independent I/O modules
within a CPX8216 system. Applications requiring dense processing power could use all twelve
I/O slots to support nonsystem processors.
Such a system would be protected against a CPU or HSC fault, but it would be vulnerable to
data losses if any of the I/O modules or nonsystem processor modules were to fail. In systems
handling critical data, it is possible to implement a 2N or an N+1 I/O redundancy strategy that
allows the level of service to be continued in the event that a module fails.
In the case of a 2N-redundant system, each I/O module or nonsystem processor module is
matched with an identical module on the other bus. The paired modules can be configured in
an active/passive arrangement or a load-sharing arrangement in which each carries half of the
load of a single module. In an N+1 arrangement, multiple modules are backed up by a single
spare. For example, a single passive nonsystem processor module can be used to back up five
others.
Figure 2-7. Active/Active Configuration
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CPU
HSC Bridge
I/O Slot
None
I/O Domain A I/O Domain B
A B B A
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