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Pavel Shevaev | 9 Mar 2011 20:18
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Re: Strange hiccups for new socket connections in Debian Lenny using 2.6.26-2-openvz-amd64

> On a moderately busy server I've experienced a strange behavior - new
> socket connections from remote hosts to the server running in VE were
> established with large delays(3-5 seconds) from time to time. I've
> noticed this in php-fpm slow logs - mysqli_connect popped very
> frequently.

Sorry, I'm replying to myself. It turned out to be a faulty networking
switch in the data center and an OpenVZ issue....

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Best regards, Pavel
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Pavel Shevaev | 9 Mar 2011 20:36
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Crazy IO utilization in VE running on Debian Squeeze host

Folks,

I tried using OpenVZ(2.6.32-5-openvz-amd64) on a Debian Squeeze host
and I faced _crazy_ IO utilization numbers(99-101%) for a VE which has
unlimited resources.

The VE is running Percona Server(a patched version of MySQL). I've
never had such issues with it on the same load on the "real" hardware
node.

And the worst part - I've faced several INNODB data corruptions in VE.
After that I moved Percona onto the hardware node and now all IO
problems are gone(at least running 6 hours without a glitch as of this
writing)....

Maybe it's not a good idea to use OpenVZ 2.6.32 kernel on production
yet? If yes, what is the best version of OpenVZ kernel to be used on
production?

--

-- 
Best regards, Pavel
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John Drescher | 9 Mar 2011 20:49
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Re: Crazy IO utilization in VE running on Debian Squeeze host

> Maybe it's not a good idea to use OpenVZ 2.6.32 kernel on production
> yet? If yes, what is the best version of OpenVZ kernel to be used on
> production?
>

I have been using OpenVZ 2.6.32 kernel in production for around 1 year
on several machines at home and at work and I do not have this issue.
Although I am using gentoo and the git kernel

http://git.openvz.org/?p=linux-2.6.32-openvz;a=summary

John
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Valentine Gostev | 9 Mar 2011 20:51
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Re: Crazy IO utilization in VE running on Debian Squeeze host

Hi Pavel,

2.6.18 (EL5) and 2.6.9 (EL4) are considered as stable branches of OpenVZ kernel
2.6.32 is development.

I used 2.6.32 for tests (RHEL6) - such problems were not met.

2011/3/10 Pavel Shevaev <pacha.shevaev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Folks,

I tried using OpenVZ(2.6.32-5-openvz-amd64) on a Debian Squeeze host
and I faced _crazy_ IO utilization numbers(99-101%) for a VE which has
unlimited resources.

The VE is running Percona Server(a patched version of MySQL). I've
never had such issues with it on the same load on the "real" hardware
node.

And the worst part - I've faced several INNODB data corruptions in VE.
After that I moved Percona onto the hardware node and now all IO
problems are gone(at least running 6 hours without a glitch as of this
writing)....

Maybe it's not a good idea to use OpenVZ 2.6.32 kernel on production
yet? If yes, what is the best version of OpenVZ kernel to be used on
production?

--
Best regards, Pavel
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Pavel Shevaev | 9 Mar 2011 20:58
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Re: Crazy IO utilization in VE running on Debian Squeeze host

> I have been using OpenVZ 2.6.32 kernel in production for around 1 year
> on several machines at home and at work and I do not have this issue.
> Although I am using gentoo and the git kernel
>
> http://git.openvz.org/?p=linux-2.6.32-openvz;a=summary

Thanks for reply, however it seems I'm not the only one -
http://openvz.org/pipermail/users/2010-September/003822.html

BTW, some more details about my IO hardware: the server uses hardware
RAID-10 with BBU. Initially Percona was running using O_DIRECT for
InnoDB flushing but then I switched to the default flushing mode and
IO numbers became somewhat better... However after this I got several
data corruptions and simply stopped any further experiments.

--

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Best regards, Pavel
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shule ney | 12 Mar 2011 21:16
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Question about the changed kernel

Hi,all. I got a question about the kernel: I changed the linux kernel due to some reason, I know using Openvz has to patch the kernel before. But this is the history, now can I use Openvz upon my changed kernel with the regular installation process, is there anything I should do?? Thanks very much to reply.
 
Best Regards
gene 

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Scott Dowdle | 14 Mar 2011 15:37
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Re: Question about the changed kernel

Gene,

----- Original Message -----
> Hi,all. I got a question about the kernel: I changed the linux kernel
> due to some reason, I know using Openvz has to patch the kernel
> before. But this is the history, now can I use Openvz upon my
> changed kernel with the regular installation process, is there
> anything I should do??

I don't really understand your question.  Did you compile your own kernel and are asking how to install it?

TYL,
--

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Scott Dowdle
704 Church Street
Belgrade, MT 59714
(406)388-0827 [home]
(406)994-3931 [work]
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Scott Dowdle | 14 Mar 2011 16:48
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Re: Question about the changed kernel

Gene,

----- Original Message -----
> Here I mean the kernel that I‘m now using is not the vanilla or
> redhat kernel，I changed the kernel by myself， so is there any
> difference when installing OpenVz?

I don't know.  I guess it depends on if the kernel packages provided by the OpenVZ Project work for you out of
the box... or if you need to compile your own like you have previously.  Give one of the stock ones a try and see
if it works for you or not.  Since you haven't stated why you decided to compile your own... if it was needed
for hardware support missing in a vendor kernel... or if you just wanted to... I don't have much info to go on.

TYL,
--

-- 
Scott Dowdle
704 Church Street
Belgrade, MT 59714
(406)388-0827 [home]
(406)994-3931 [work]
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shule ney | 14 Mar 2011 16:18
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Re: Question about the changed kernel

Here I mean the kernel that I‘m now using is not the vanilla or redhat kernel，I changed the kernel by myself， so is there any difference  when installing OpenVz?  


2011/3/14 Scott Dowdle <dowdle-yBMptiTp05F74goWV3ctuw@public.gmane.org>
Gene,

----- Original Message -----
> Hi,all. I got a question about the kernel: I changed the linux kernel
> due to some reason, I know using Openvz has to patch the kernel
> before. But this is the history, now can I use Openvz upon my
> changed kernel with the regular installation process, is there
> anything I should do??

I don't really understand your question.  Did you compile your own kernel and are asking how to install it?

TYL,
--
Scott Dowdle
704 Church Street
Belgrade, MT 59714
(406)388-0827 [home]
(406)994-3931 [work]
_______________________________________________
Users mailing list
Users-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org
https://openvz.org/mailman/listinfo/users

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Steffan | 16 Mar 2011 10:45
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memory usage

Hello,

Question
I have a big node running several containers
Below the memory usages
What is important for performance
The Physical memory usage (88%)
Or the kernel+ applications (28%)
Has someone a explanation how to read this ?

Memory Usage 
Type 					Percent Capacity Free 	Used 		Size 
Physical Memory   			88%  	2.74 GB 		20.96 GB 23.71 GB 
- Kernel + applications   	28%    6.64 GB   
- Buffers   				3%    837.63 MB   
- Cached   				57%    13.51 GB   
Disk Swap   				0%  3.99 GB 8.21 MB 4.00 GB 

Thanxs

Steffan
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