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Crazy IO utilization in VE running on Debian Squeeze host [message #42148] Wed, 09 March 2011 19:36 Go to next message
Pavel Shevaev is currently offline  Pavel Shevaev
Messages: 4
Registered: February 2011
Junior Member
From: *parallels.com
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
Re: Crazy IO utilization in VE running on Debian Squeeze host [message #42149 is a reply to message #42148] Wed, 09 March 2011 19:49 Go to previous messageGo to next message
drescherjm is currently offline  drescherjm
Messages: 27
Registered: February 2008
Junior Member
From: *parallels.com
> 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
Re: Crazy IO utilization in VE running on Debian Squeeze host [message #42150 is a reply to message #42148] Wed, 09 March 2011 19:51 Go to previous messageGo to next message
Valentine Gostev is currently offline  Valentine Gostev
Messages: 1
Registered: March 2011
Junior Member
From: *parallels.com
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@gmail.com>

> 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
--
----------------
Best regards,
Valentine Gostev
Re: Crazy IO utilization in VE running on Debian Squeeze host [message #42151 is a reply to message #42149] Wed, 09 March 2011 19:58 Go to previous message
Pavel Shevaev is currently offline  Pavel Shevaev
Messages: 4
Registered: February 2011
Junior Member
From: *parallels.com
> 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.

--
Best regards, Pavel
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