| IO Performance on OpenVZ [message #33669] |
Thu, 30 October 2008 17:12  |
ulver
Messages: 12
Registered: July 2008
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Junior Member |
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Hello everyone,
first, i'm sorry for my very bad english, i'll do my best, i hope you will understand me.
I've a question about io disk performance on openvz.
I think i'm doing something wrong because I have strange behaviours with io disk and bad performances.
I have 2 servers (with exactly the same hardware), one with OpenVZ kernel 2.6.18-12-fza-amd64 (server A), and the other with Vserver kernel 2.6.18-5-vserver-amd64 (server B). The distribution is Debian (same configuration).
There are 5 VM on the server A, 5 VM on the server B
If I do, for example, a :
- du -s /home/dir1" on the server A and
- du -s /home/dir1" on the server 2
(it's the same directory = ~20GB)
I noticed that the server B with Vserver is twice as much fast as the server A with OpenVZ (it gives me the answer in 3 minutes for example and server B in 6 minutes...).
I also noticed that server A had a load average of 6 whereas the server B had just 2~3.
I know that it's not a very interesting test, but i've the same feelings with rsync, cp etc... (every operations which consist in io disk...), and with all servers that i've deployed with OpenVZ. That's why i think i'm doing something wrong.
Do you think UBC parameters can have an impact on this ?
Thank you very much !
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| Re: IO Performance on OpenVZ [message #34614 is a reply to message #33669] |
Wed, 21 January 2009 02:54  |
devonblzx
Messages: 127
Registered: December 2006
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Senior Member |
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I'm assuming your using Debian based on the kernel?
We have been having issues with memory leaking on the Debian kernels, more so on the fza-12 version. Even running fza-14 currently we have issues with memory leaks. It is most likely the swapping that is causing I/O issues which was the same with ours. Upgrading the kernel helped but it still has issues.
ByteOnSite President
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