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1.7 Multinode scalable partitions
The x455 can be configured as part of a multinode partition. The partition can
comprise either two nodes or four nodes. The partition is a hardware partition,
which is invisible to the operating system. From an operating system point of view
it sees all the hardware as a single machine.
All nodes in a scalable partition must have the following:
Same base model
Processors that have the same core speed and cache
Memory mirroring that is configured the same on all nodes, that is, either all
enabled or all disabled
When you have a multi-node configuration, all nodes must be fully populated with
processors. In other words, only eight-way and 16-way CPU configurations are
supported.
Conceptually two-node and four-node partitions are depicted in Figure 1-11 and
Figure 1-12 on page 23. These also show the cable requirements.
Figure 1-11 Two-node partition
IBM Eserver xSeries 455 Planning and Installation Guide
22
x455
1
Node A
3
2
1
SMP
2
Scalability
ports
3
3
2
x455
1
Node B
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