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I/O Problems in 70.7 kernel [message #41053] Sun, 07 November 2010 12:55 Go to next message
seanfulton is currently offline  seanfulton
Messages: 105
Registered: May 2007
Senior Member
I've identified some SERIOUS I/O issues in the 70.7 Rhel5 kernel. If I run a moderately-loaded VE on the server, and cat a large SQL file into MySQL to create a new database in another VE, the first VE essentially blocks all disk I/O.

I had this problem before while running my nightly backups but it never got resolved. However I think this is much more serious as it means one VE can bring down another. I happened to be able to run a test between this kernel and the same machine/ve combination running the 68.5 kernel and 68.5 doesn't exhibit this problem. However, 68.5 has other problems.

Any recommendations for a kernel that doesn't have I/O problems? Anyone using the testing kernels in a production environment? Anyone else having this problem?


sean

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Re: I/O Problems in 70.7 kernel [message #41061 is a reply to message #41053] Wed, 10 November 2010 05:48 Go to previous messageGo to next message
Speedy059 is currently offline  Speedy059
Messages: 7
Registered: August 2009
Location: Arizona
Junior Member
I to have noticed that the newest kernel downgraded our HD i/o. We have to live with it unfortunately since any older kernel has the 64Bit vulnerabilities. I wish we could go back to an older kernel for better performance, hopefully the new kernel(s) will improve the HD i/o performances.

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Re: I/O Problems in 70.7 kernel [message #41064 is a reply to message #41053] Wed, 10 November 2010 14:06 Go to previous messageGo to next message
Ales is currently offline  Ales
Messages: 330
Registered: May 2009
Senior Member
Did you file a bug?

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Re: I/O Problems in 70.7 kernel [message #41066 is a reply to message #41061] Wed, 10 November 2010 14:37 Go to previous messageGo to next message
seanfulton is currently offline  seanfulton
Messages: 105
Registered: May 2007
Senior Member
In desperation I tried the 2.6.18-194.17.1.el5.028stab077.1 kernel from the testing branch (after testing it on a couple of i386 machines for a few days). It seems to have alleviated the problem and hasn't crashed yet, so it might be a good alternative.

I'd be interested to hear if it helps you as well because I am considering rolling it out to all of our machines.

sean

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Re: I/O Problems in 70.7 kernel [message #41067 is a reply to message #41064] Wed, 10 November 2010 14:38 Go to previous message
seanfulton is currently offline  seanfulton
Messages: 105
Registered: May 2007
Senior Member
Yes, I did file a bug but I never got any meaningful response.

http://bugzilla.openvz.org/show_bug.cgi?id=1676

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