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Status Future consideration
Workspace IBM Z and LinuxONE Systems Hardware
Categories General/Miscellaneous
Created by Guest
Created on Jun 20, 2025

RELATED IDEAS

Enable System Recovery Boost for DMR Events Triggered By Drawer Swaps

On IBM z16 servers, we have observed a significant increase in the cost of accessing data/memory located in a remote drawer. In certain scenarios, this can result in a notable increase in CPI, leading to an LPAR’s CPU utilization doubling -or even tripling- compared to its baseline without a proportional increase in workload.

To address this issue holistically, we are submitting a series of three related ideas. This is the first one of these three and propose an enhancement based on System Recovery Boost to  mitigating the business impact of this issue:

When a drawer swap occurs and a Dynamic Memory Relocation (DMR) operation is initiated, the operation should be classified as a recovery action and automatically trigger the System Recovery Boost(SRB) feature for the affected LPAR(s). While the approach will not directly eliminate the latency or the costs associated with remote memory access, it will provide temporary additional capacity. This can help absorb the MSU spike and minimize the risk of service degradation by leveraging existing zIIP engines.

This enhancement would improve system resiliency during transient high CPI periods caused by hardware topology changes and support more predictable performance in mission-critical workloads.

Idea priority High
  • Guest
    Sep 11, 2025
    The lab believes this idea is generally practicable. Cross-team discussions are ongoing and details TBD.
    Reply

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