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ESX host console message: Significant imbalance between NUMA nodes detected (1018754)

Symptoms

  • When accessing the console of the ESX host, you see a message similar to:

    TSC: 631030280 cpu0:0)NUMA:827 : Significant imbalance between NUMA nodes detected. Performance may be impacted.
     
  • This issue may occur after upgrading your ESX host.

Resolution

This message occurs when memory is not evenly distributed between processor sockets.

Each CPU socket has its own RAM slots. To resolve this issue, evenly balance RAM modules between processor sockets. That is, ensure that each bank of RAM slots has the same amount of RAM.
 
For example, if CPU socket 1 has a total of 8 GB of RAM, ensure that CPU socket 2 also has 8 GB of RAM.

Ensure that memory on the nodes are balanced. For more information and assistance, contact your vendor.
 
Note: Damaged or faulty physical RAM modules can also cause this issue.



 

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