NFS problem in the latest kernel (Was: [CentOS] MySQL issues with kernel-2.6.18-53.1.6.el5.x86_64.rpm)
nate
centos at linuxpowered.netThu Jan 31 18:28:52 UTC 2008
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Akemi Yagi wrote: > This problem does not seem to be associated with specific hardware as > implied in the original thread. The person on the SciLinux mail list > has Dell machines, and I was able to confirm the issue using custom > built boxes. I have added a note in the bug tracker at: > > http://bugs.centos.org/view.php?id=2635 Unrelated, but still kind of related, I'm only replying because of how crazy I went trying to track it down. But I had major NFS client issues on CentOS 4.5, specifically kernels after 2.6.9-55.ELsmp. Even under pretty light load, after seemingly random periods of time NFS write performance would go down 99.99999%. Read performance was fine. Downgrade the kernel and it worked fine again. Eventually for servers that ran our critical apps for NFS I just upgraded them to CentOS 5.1 and there is no problems there for us at least. Spent several weeks researching the problem but never found a solution, since it took so long to reproduce(up to 24 hours typically), testing different configurations was very time consuming. And no I haven't filed any bug reports or anything as I wanted to try to narrow it down further to find the source before that. But I ran out of time, and the kernel in CentOS 5.1 seems to work fine. (migrated production systems to it about 6 weeks ago) The newer kernel didn't/does not affect the NFS servers at all, as they are all running CentOS 4.5 with 2.6.9-55.0.9.ELsmp, it's purely a client-side issue. (sorry, end rant :) ) nate
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