Vanguard 6500 PLUS Installation Manual

Installation 2-29
Installing Nodes in Modulus Enclosures
Multiprocessor Nodes
Introduction A node based on the 6507
PLUS
or the 6525
PLUS
processor card can contain more than
one processor card to improve reliability and availability. The two processor cards
provide backup support to each other.
Multiprocessor
Node Example
Figure 2-7 shows a multiprocessor node where an enclosure is configured for two
6507
PLUS
or two 6525
PLUS
cards.
Figure 2-7. Multiprocessor Node
Operation This is how a multiprocessor node operates under normal conditions, with both
processors working.
• Processor 1 handles the I/O interrupts from its own six on-board ports.
The processor card in the lowest-numbered slot is the master. In Figure 2-7,
Processor 1 is the master processor.
• Processor 2 handles its own on-board interrupts plus those from universal I/O
cards 1 and 2 and the asynchronous I/O card.
• If Processor 2 fails, the node restarts and Processor 2 is disabled. When a
processor card is disabled, interrupt requests generated by cards to the right
pass to the processor card on its left. While overall throughput is reduced,
links to the right of the failed processor are restored automatically.
Slot 5
Async I/O
Slot 4
Universal I/O 2
Slot 3
Universal I/O 1
Slot 2
Processor 2
Slot 1
Processor 1