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Re: OpenVZ IO Isolation ? [message #42604 is a reply to message #42557]

Thu, 05 May 2011 18:28

seanfulton
Messages: 105
Registered: May 2007

Senior Member

I'm not using iopro or ionice. And I'm not even talking about nuanced performance improvements.

The I/O problems I see manifest themselves pretty ham-fistedly.

It's pretty simple to reproduce. Just take any big mysqldump file that is compressed, and try to restore it (talking 5G or more):

zcat file.sql.gz | mysql database

in VE1 can cause *all* disk activity in the other VE's to halt. System load peaks as the processes lock in a wait state, and things get really ugly.

Reboot in a different kernel, no other changes, and everything is fine.

What I don't understand is why I see this in one kernel, upgrade and the problem goes away. Then a few months (and kernel upgrades) later after I've forgotten about it, the problem re-appears.

sean

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[Message index]

		OpenVZ IO Isolation ? By: andre on Thu, 28 April 2011 14:22
		Re: OpenVZ IO Isolation ? By: seanfulton on Sun, 01 May 2011 18:10
		Re: OpenVZ IO Isolation ? By: seanfulton on Tue, 03 May 2011 20:40
		Re: OpenVZ IO Isolation ? By: swindmill on Thu, 05 May 2011 17:07
		Re: OpenVZ IO Isolation ? By: seanfulton on Thu, 05 May 2011 18:28
		Re: OpenVZ IO Isolation ? By: swindmill on Thu, 05 May 2011 18:37
		Re: OpenVZ IO Isolation ? By: seanfulton on Thu, 05 May 2011 18:46
		Re: OpenVZ IO Isolation ? By: andre on Tue, 30 August 2011 00:58
		Re: OpenVZ IO Isolation ? By: seanfulton on Tue, 30 August 2011 15:26
		Re: OpenVZ IO Isolation ? By: andre on Wed, 31 August 2011 20:27
		Re: OpenVZ IO Isolation ? By: mustardman on Fri, 02 September 2011 17:04
		Re: OpenVZ IO Isolation ? By: seanfulton on Fri, 02 September 2011 18:06
		Re: OpenVZ IO Isolation ? By: seanfulton on Fri, 02 September 2011 18:11
		Re: OpenVZ IO Isolation ? By: mustardman on Fri, 02 September 2011 20:37
		Re: OpenVZ IO Isolation ? By: andre on Tue, 06 September 2011 02:32
		Re: OpenVZ IO Isolation ? By: raver119 on Tue, 13 September 2011 00:10

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