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тАО08-10-2010 12:15 PM
тАО08-10-2010 12:15 PM
I am thinking of adding additional memory to each ESX Host. The resulting DIMM configuration will bring me to 3 DIMM Per channel essentially lowering my max DIMM speed from 1333MHz to 800 MHz.
I understand there are other factors to consider and channels may be more important but haven't found anything speaking specicially to vSphere or even virtualization in general. I have to believe one is a better choice. Bottom line is I don't want to drastically or even slightly noticeably affect performance with the proposed configuration change.
I have read through this but, still haven't found anything to push me definatively one way or the other.
http://dl.dropbox.com/u/9715225/DDR3%20Configuration%20Recommendations.pdf
Current:
2-DIMM per channel(12-8GB DIMMs)
1333 MHz
96GB
Proposed:
3-DIMM per channel(18-8GB DIMMs)
effectively 800MHz
144GB
Solved! Go to Solution.
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тАО08-11-2010 10:56 PM
тАО08-11-2010 10:56 PM
Solutioncheck this sites about the memmory :
http://h18004.www1.hp.com/products/servers/options/memory-description.html
http://h18004.www1.hp.com/products/servers/options/tool/hp_memtool.html
In my personal opinion the G6 and the G7 options of the memmory is the same.
mikap
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тАО08-12-2010 04:17 AM
тАО08-12-2010 04:17 AM
Re: Proper DL380 G6/G7 DDR3 memory configuration for vSphere
My question is more about DIMM speed and memory channels as they relate to total performance in this case for a vSphere ESX server.
When incresing channels from 2-3, DIMM speed decreases. I'd like to find performance comparisons between my 2 scenerios. Does adding a channel (from 2-3) but lowering DIMM speed (1333-800 Mhz)increase or decrease observed performance?
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тАО08-12-2010 04:22 AM
тАО08-12-2010 04:22 AM
Re: Proper DL380 G6/G7 DDR3 memory configuration for vSphere
of course the performance will be decreased if add more memory modules per channel, you will decrease the frequency MHz. It always depend on the application running inside the VM.
mikap
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тАО08-13-2010 01:00 PM
тАО08-13-2010 01:00 PM
Re: Proper DL380 G6/G7 DDR3 memory configuration for vSphere
My $0.02: Check the host memory utilization metrics under VMWare, especially Swap Used and Memory Balloon graphs. If either of those two are high, you're probably memory constrained, and you might be better off with 144GB. If both are relatively low, stick with 96GB.
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тАО08-13-2010 01:28 PM
тАО08-13-2010 01:28 PM
Re: Proper DL380 G6/G7 DDR3 memory configuration for vSphere
I do assume there are alot of "it depends" related to VM roles etc. but, I would guess that the performance scale would tip one way or the other using a broad spectrum of applications.
I'll probably do these tests myself but, wondered if their was any data out there or what peoples theories might be.