I am using a single RHEL4 box with a single server and one RHEL5 client accessing it. That was the simplest way I could reproduce, so I have stuck with it. There is nothing spectacular about either machine. If you track down the issues with running multiple servers on the same box, I would love to get the details.
Bart. On Wed, Oct 20, 2010 at 9:39 AM, Becky Ligon <[email protected]> wrote: > Bart: > > What is the topology of your test system? > > At Clemson, when running tests on a SUN box with 8 Quad-Core AMD Opteron > Processor 2356 and the latest cvs version of pvfs, I was getting a lot of > timing issues when running 4 servers on the one box, justing using the cp > command. I am still trying to run down the problems. > > Becky > -- > Becky Ligon > PVFS Developer > Clemson University > 864-650-4065 > > > I can reproduce it fairly reliably with my test case; I average somewhere > > around a 50% chance of generating one or more of these files per test. My > > preliminary testing with db 4.8.30 is encouraging. I will update this > > thread > > with any conclusions. > > > > Bart. > > > > > > > > On Tue, Oct 19, 2010 at 3:41 PM, Phil Carns <[email protected]> wrote: > > > >> > >> Removing the metadata object for a file does indeed produce the same > >>> symptoms we are seeing. It produces a similar effect on 2.8 as well. I > >>> believe I was working with Sam and possibly you on this a few weeks ago > >>> but > >>> had to drop it for something more urgent. Our conversation can be found > >>> here: > >>> > >>> > >>> > http://www.beowulf-underground.org/pipermail/pvfs2-developers/2010-June/004605.html > >>> > >>> In 2.8, pvfs2-rm does not currently remove the file entries. Sam had > >>> the > >>> same ENOTENT fix for 2.8. After creating a file and removing the > >>> metadata > >>> object, it allows the file entry to be removed. > >>> > >> > >> Ah! Believe it or not I had forgotten about that thread, but Sam's fix > >> must have stuck in my head subconsciously because I figured out where to > >> add > >> that check in 2.6 pretty quickly :) > >> > >> We need to get this fix into cvs if it isn't there already... > >> > >> > >> I believe Jim Kusznir may have been experiencing similar issues when he > >>> posted to the Users list here: > >>> > >>> > >>> > http://www.beowulf-underground.org/pipermail/pvfs2-users/2010-September/003186.html > >>> > >>> It appears that something is still triggering this issue in 2.8. Based > >>> on > >>> my own anecdotal evidence with 2.6 and 2.8, it looks like it can happen > >>> when > >>> a file system is getting hammered with creates and/or deletes. My test > >>> case > >>> to reproduce on 2.8 involved several threads executing a script that > >>> creates, opens, writes, and then deletes a file many thousands of > >>> times. The > >>> problems we have had on 2.6 also correlate to heavy loads of file > >>> creations > >>> and deletions. > >>> > >>> Anyone have thoughts on why some files are getting left without their > >>> metadata object? > >>> > >>> Bart. > >>> > >> > >> I think Becky had some good ideas. How hard is this to reproduce? Can > >> you > >> do it pretty reliably with your test case? > >> > >> -Phil > >> > > _______________________________________________ > > Pvfs2-developers mailing list > > [email protected] > > http://www.beowulf-underground.org/mailman/listinfo/pvfs2-developers > > > >
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