| Re: Disabling all limits [message #35654 is a reply to message #35648] |
Fri, 10 April 2009 09:57   |
divB
Messages: 79
Registered: April 2009
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| maratrus wrote on Fri, 10 April 2009 02:50 |
Hi,
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What I do: I have written a small awk-script which monitors the sum of the failcnt-column in /proc/user_beancounters and if this value is >= 0
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This approach is not correct. You should monitor if faicnt are increasing not if they are just >0.
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... and restarting the VE.
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after you've adjusted ubc-parameter you don't have to restart VE.
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I think we have a misunderstanding here. In my case, the goal is to find out how much ressources are needed by my servers. So I just want to do a short "learning phase" (i.e. 1 week) and observe the "failcnt" field. If it is > 0 then my VE need more ressources. I adjust the parameters, restart and hope that the VEs work now normal.
There are at least two use cases for OpenVZ:
1.) Maybe the most popular: vServer hosting. In this case it's good to strictly apply ressource barriers.
2.) Virtualize private servers. This is my case. In normal conditions there should not be any malicous software; it's better to be sure that all my own services run reliably. So in this case I want each VE to give as much ressources as they need.
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This means that this value is just ~100 too low; what to I do?
vzctl set 201 --privvmpages 87536:91632 --save
and restarting the VE. As you can see, I add 10000 (!) although only 97 are needed. But some time after restarting: same result. I adjusted the limit a few times now but failcnt becomes always nonzero for this specific limit after some time. So, what I am doing wrong?
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Sorry, I didn't catch you at all. What are 100 and 10000? What kind of parameters do you measure?
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This is my key question: What to do if the ressources are too low? Just adding the "failcnt" value? Adding 10? Adding 100? Multiplying with 2? Multiplying with 5?
For example, I have privvmpages 57536:71632. Then, after some time failcnt=100. Adjusting to $((57536+100)):$((71632+100)) seems not to help, so I did $((57536+10000)):$((71632+10000)) = 67536:61632.
I hope you can follow me now. The key question is: How to change the limit values for a given "failcnt" in order to ensure reliable VEs?
Thank you. I will wait the 5 minutes after rebooting the VE  As said, I just want to do this in my "learning phase".
divB
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