2V0-622 · 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. The ESXi warning about significant NUMA node imbalance indicates that physical RAM is not evenly distributed across processor sockets, causing one NUMA node to handle disproportionate memory traffic. Evenly populating RAM modules across all CPU sockets corrects this…
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
(29 responses)- A83% (24)
- B3% (1)
- C7% (2)
- D7% (2)
Why each option
The ESXi warning about significant NUMA node imbalance indicates that physical RAM is not evenly distributed across processor sockets, causing one NUMA node to handle disproportionate memory traffic. Evenly populating RAM modules across all CPU sockets corrects this hardware-level imbalance.
In a NUMA architecture, each processor socket has its own local memory channels; when RAM modules are unevenly distributed across sockets, one NUMA node lacks local memory and must service requests from the other node's memory remotely, directly causing the imbalance ESXi detects, so even distribution across all sockets eliminates the disparity.
Populating only the memory banks associated with CPU Socket 0 concentrates all RAM on a single NUMA node, which would make the imbalance worse rather than correcting it.
Installing the maximum amount of RAM increases total capacity but does not address the distribution of memory across NUMA nodes, so the imbalance between nodes would persist.
ECC memory modules provide hardware error correction for data integrity and have no relationship to NUMA topology, memory channel balance, or remote memory access latency.
Concept tested: Physical NUMA memory distribution balance across CPU sockets
Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-CF2A8059-8DAE-4F49-8D38-2B05DED1B03C.html
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