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Main Storage Concepts
Memory Allocation Facts
Power4 Hypervisor allocated memory equally from all nodes
This leads to more “remote” memory access
Power5 hypervisor tries to do better ...
Processors are assigned on the fewest nodes possible
Configured memory will be assigned keeping as much memory as possible on the same node
The HPT for the partition will be assigned on the same node
How becomes memory affinity with dynamic processor/memory moves ?
The system will “do its best” ...
But there is no guarantee that the best configuration can be maintained
A full system restart (hypervisor) may be needed to return system in its optimal configuration !
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iSeries. mySeries.
iSeries. mySeries.
Logical Partitions on the IBM Power5
Resources Management Concepts
I/O Subsystem
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