Re: [BackupPC-users] Duplicate files in pool with same CHECKSUM and same CONTENTS
2008-10-30 11:12:36
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Jeffrey J. Kosowsky wrote:
> Holger Parplies wrote at about 11:29:49 +0100 on Thursday, October 30, 2008:
> > Hi,
> >
> > Jeffrey J. Kosowsky wrote on 2008-10-30 03:55:16 -0400 [[BackupPC-users]
> Duplicate files in pool with same CHECKSUM and same CONTENTS]:
> > > I have found a number of files in my pool that have the same checksum
> > > (other than a trailing _0 or _1) and also the SAME CONTENT. Each copy
> > > has a few links to it by the way.
> > >
> > > Why is this happening?
> >
> > presumably creating a link sometimes fails, so BackupPC copies the file,
> > assuming the hard link limit has been reached. I suspect problems with your
> > NFS server, though not a "stale NFS file handle" in this case, since
> copying
> > the file succeeds. Strange.
>
> Yes - I am beginning to think that may be true. However as I mentioned
> in the other thread, the syslog on the nfs server is clean and the one
> on the client shows only about a dozen or so nfs timeouts over the
> past 12 hours which is the time period I am looking at now. Otherwise,
> I don't see any nfs errors.
> So if it is a nfs problem, something seems to be happening somewhat
> randomly and invisibly to the filesystem.
See this URL which assisted me in improving the performance, and
reducing NFS errors in my environment.
http://billharlan.com/pub/papers/NFS_for_clusters.html
It was written a long time ago, but most of it is stall very relevant (I
guess NFS has not changed much).
In my case, the actual problem was faulty memory in a new server plus
some sort of strange network card driver problem corrupting the NFS
packets....
It truly surprised me just how many errors I was getting even from my
existing load which I had never noticed.....
Regards,
Adam
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