Re: NFS corruption (duplicated data)

[Russell Cattelan]

Ya it's probably the same problem.

To really understand what is going on in terms of corruption
pattern up the disk with a known pattern and re-run the test.

If the corrupted areas show up as the known pattern you are dealing
with stale disk data and not data from the wrong file/process.

And at that point I would definitely say it's bug:
http://oss.sgi.com/bugzilla/show_bug.cgi?id=198
On Jun 8, 2004, at 6:51 PM, Nathan Scott wrote:

> Hi Andy,
>
> Be good to try this with files served from ext2/3 as well,
> to try isolate it to XFS/NFS.  We have a known issue thats
> possibly related to this in XFS - Russell, does this sound
> like that problem you've been looking at?
>
> If you have a simple test case to reproduce it (we have an
> extremely complex test case to reproduce that other issue,
> but from your description I'm not sure its the same), that
> would be very helpful Andy.
>
> thanks.
>
> On Tue, Jun 08, 2004 at 10:44:22AM -0500, Andy wrote:
> > I really don't understand what could be causing this, but it happens 
> > on
> > several machine and at least on kernels 2.4.22, 2.4.25, 2.4.26.
> > NFS v3 : hard, udp, rsize=8192,wsize=8192
> > local filesystems are XFS
> >
> > Trond, this is data corruption not dropped packets so the protocol
> > being UDP is not the problem.
> >
> > Here is what is happening :
> >
> > Copying a file of offsets from machine A to machine B over NFS and 
> > then
> > comparing the file on B with the file on A over NFS, the file on 
> > machine B
> > is corrupted in the following ways.
> >
> > Usually, data earlier in the file will show up again later.
> > For example :
> >
> > 57344 bytes of data from 672190464-672247807 is also in positions
> > 1449664512-1449721855
> >
> > sometimes, data later in the file is dupped to a position before it
> > should be
> >
> > 53248 bytes of data from 1197158400-1197211647 is also in positions
> > 1036660736-1036713983
> >
> > Any ideas
> >
> > Andy
> > -
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> --
> Nathan

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