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Status Submitted
Workspace Hardware Management Console
Created by Guest
Created on Jul 31, 2026

RELATED IDEAS

HMC vCPU Target Assignment Should Always Reach the Requested Target Value

HMC vCPU Target Assignment Should Always Reach the Requested Target Value

Description

When modifying vCPU allocation in HMC, administrators enter a target value (for example, 20 vCPU). Internally, HMC appears to calculate a delta (e.g. -10 vCPU).

If the same target value is entered again while the original operation is still running, the delta may be applied a second time, causing the partition to end below the requested target.

Example:

  • Current allocation: 30 vCPU
  • Target entered: 20 vCPU
  • Internal calculation: -10 vCPU
  • Target entered again before completion
  • Final result: 10 vCPU instead of 20 vCPU

Requested Enhancement

HMC should treat the entered value as the desired end state and always converge to that target, regardless of how often the same value is submitted while the operation is in progress.

Business Value

  • Prevent incorrect CPU allocations
  • Improve predictability and usability
  • Reduce operational errors
  • Align behavior with administrator expectations and desired-state principles

Customer Impact

Administrators expect a target value of 20 vCPU to always result in 20 vCPU, even if the same request is submitted multiple times while a previous adjustment is still being processed.

Idea priority Medium
  • Guest
    Jul 31, 2026

    Additional Customer Feedback (Thanks Patrick!)

    Another customer reported similar behavior when a HMC DLPAR operation does not complete within the configured execution time (default: 5 minutes). The operation may continue in the background and remain visible on AIX as a chrp process.

    The customer recommends increasing the DLPAR execution time (e.g. to 120 minutes).

    Regardless of the underlying cause, the expectation remains that a target value should always result in the requested final configuration and should not be applied multiple times when re-entered while an earlier operation is still running.

    Reply

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