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Status Future consideration
Workspace Power Systems Design
Created by Guest
Created on Apr 24, 2024

RELATED IDEAS

Request for a function to allow user to specify the number of sockets DPO(Dynamic Platform Optimizer) should consolidate an LPAR into instead of spreading out across all 4 sockets for large LPARs

We have optimized Power E1080 CPU/Memory affinity, try to consolidate each LPARs into 2 sockets, but failed. How to do it now?

IBM responsible engineer feedback the following info.:

The DPO (Dynamic Platform Optimizer) has a built-in algorithm which automatically determine the memory affinity layout.

In general, it will consolidate small LPARs into one socket but for larger LPARs, it tends to spread out the allocation to maximised

redundancy over different sockets.

As we cannot control the behaviour of the DPO function, what we did was to manually influence the layout of the allocation by

reducing the memory size to consolidate into 2 sockets before adding the memory in small steps to get the system to allocate

memory on the same sockets as the allocated CPU.  This seems to work only one LPAR but the next one end up with a unbalance

configuration over 4 sockets.

To sum it, the system’s algorithm favours spreading the CPU/memory over the maximum number of sockets for large LPARs

to improve redundancy.  Manual influencing of allocation is a trial and error method that does not always work.

Idea priority Urgent
  • Guest
    Reply
    |     May 22, 2024
    The current behavior of the PowerVM hypervisor is documented in IBM Power Virtualization Best Practices Guide https://www.ibm.com/downloads/cas/JVGZA8RW and as was documented in this IBM Idea request, partitions larger than a single processor chip will be spread across all of the chips in a drawer on a E1080. IBM understands this Idea request to allow customer to have better control over how resources are assigned to partitions and is considering enhancements to the current offerings.

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