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тАО01-08-2010 10:52 AM
тАО01-08-2010 10:52 AM
Recently we've found this message after a successful ESX4 installation:
"Signficant imbalance between NUMA nodes detected. Performance may be impacted."
Server is a BL460c G6, with two CPUs and a dissimilar amount of ram (3x2GB and 1x4GB).
Is there a way to disable NUMA funcionality within the RBSU or boot-time parameters?
Thanks a lot for your responses,
Albatross
Solved! Go to Solution.
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тАО01-08-2010 11:56 AM
тАО01-08-2010 11:56 AM
Re: VS4 NUMA nodes imbalance
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тАО01-13-2010 08:11 PM
тАО01-13-2010 08:11 PM
SolutionThis will cause the BIOS to alternate between the two processors' memory when building the system memory map.
I'm not sure how VS4 will perform, though.
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тАО05-02-2010 02:33 PM
тАО05-02-2010 02:33 PM
Re: VS4 NUMA nodes imbalance
does the g6 line if blade system use NUMA or advanced ecc for memory configuration?
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тАО05-03-2010 05:54 AM
тАО05-03-2010 05:54 AM
Re: VS4 NUMA nodes imbalance
NUMA (Non-Uniform Memory Access) is a technique to address and use memory distributed in different processors/memory controllers within the same physical system.
ECC (eror checking and correcting) allows the memory subsystem to detect memory errors and instruct the system to either correct the error or halt the system to prevent data loss/corruption (advanced ECC in the 460c G6)
The BL460c G6 supports both technologies.
Hope it helps,
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тАО01-19-2011 04:25 PM
тАО01-19-2011 04:25 PM
Re: VS4 NUMA nodes imbalance
Seems like you looked for this article:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1018754
Note: If one of the physical RAM modules is damaged or faulty, it will also cause an imbalance and thus causing the error to be thrown in the ESX console.
bl460 g6 is non-NUMA, I guess and the imbalance is caused by failing DIMM or DIMMs.
Regards,
oczkov
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тАО01-20-2011 07:34 AM
тАО01-20-2011 07:34 AM
Re: VS4 NUMA nodes imbalance
As per g6 memory rules, you can install different size memory accross processor but when it comes to ESX 4 it looks for similar memory configuration for both the processors and you will get this message...
disabling it from RBSU is one option and getting the patch from vmware for this issue is a permanent solution.
thanks,
Aftab
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