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Status Submitted
Workspace Power Systems Design
Created by Guest
Created on Aug 12, 2026

RELATED IDEAS

LPAR CPU Placement on mulit CEC systems

When you create an LPAR on a multi-CEC system, such as an E1080 or E1180, its placement is determined by its maximum virtual processor and memory configuration.

If the system already hosts many smaller LPARs, a new LPAR may be placed across two or more CECs. Currently, changing this placement is difficult: all relevant LPARs must be stopped, resources must be freed, and the LPARs must be restarted in the correct order—typically starting with the largest partition.

For memory placement, IBM provides the lsmemopt and optmem commands on the HMC. However, there is no equivalent capability for CPU placement. Testing has shown that an LPAR spread across two CECs can experience a performance impact of up to 15% compared with an LPAR placed entirely within a single CEC.

This has been an issue since POWER7. IBM has addressed it in part by increasing the number and bandwidth of inter-CEC links, but it remains relevant.

I would like IBM to provide an HMC-based capability to analyse and optimise CPU placement for active or inactive LPARs on multi-CEC Power10 and Power11 systems, comparable to the existing lsmemopt and optmem commands for memory placement.

Idea priority Medium
  • Guest
    Aug 14, 2026

    optimizing is always great !

    Reply
  • Guest
    Aug 14, 2026

    great idea

    Reply
  • Guest
    Aug 12, 2026

    good idea

    Reply

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