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Broadcom-VMware

2V0-621D · Question #163

When troubleshooting a performance related issue, an administrator sees the following warning message on an ESXi Console: Significant imbalance between NUMA nodes detected. Performance may be…

The correct answer is A. Ensure that the RAM modules are evenly balanced between processor sockets in the physical. To correct a 'Significant imbalance between NUMA nodes' warning, an administrator must balance RAM modules evenly across processor sockets to optimize memory access and improve performance.

Section 7 – Administer and Analyze vSphere 6.x Performance

Question

When troubleshooting a performance related issue, an administrator sees the following warning message on an ESXi Console:

Significant imbalance between NUMA nodes detected. Performance may be impacted. Which action should the administrator take to correct this problem?

Options

  • AEnsure that the RAM modules are evenly balanced between processor sockets in the physical
  • BEnsure that all memory banks associated with CPU Socket 0 in the physical server are
  • CEnsure that the physical server has the maximum amount of RAM modules that it can support.
  • DEnsure that all RAM modules in the host are Error-correcting code (ECC) modules.

How the community answered

(35 responses)
  • A
    83% (29)
  • B
    3% (1)
  • C
    9% (3)
  • D
    6% (2)

Why each option

To correct a 'Significant imbalance between NUMA nodes' warning, an administrator must balance RAM modules evenly across processor sockets to optimize memory access and improve performance.

AEnsure that the RAM modules are evenly balanced between processor sockets in the physicalCorrect

Balancing RAM modules evenly between processor sockets ensures that each NUMA node has a proportional share of memory resources. This configuration minimizes cross-node memory access latency, allowing CPUs to access local memory more efficiently and resolving the reported imbalance.

BEnsure that all memory banks associated with CPU Socket 0 in the physical server are

Focusing only on CPU Socket 0 does not address the overall imbalance across all NUMA nodes and processor sockets in the server.

CEnsure that the physical server has the maximum amount of RAM modules that it can support.

Maximizing the amount of RAM in the server does not inherently resolve NUMA balancing issues; the critical factor is the distribution of that RAM across the NUMA nodes.

DEnsure that all RAM modules in the host are Error-correcting code (ECC) modules.

While ECC RAM is important for data integrity, it is unrelated to NUMA balancing or the performance impact caused by uneven memory distribution.

Concept tested: NUMA node memory balancing for ESXi performance

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.monitoring.doc/GUID-A9303D95-3A26-4767-AD7E-41B081A05151.html

Topics

#NUMA imbalance#memory configuration#performance troubleshooting#physical server hardware

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