[OpenAFS] openafs performace problems

Rich Sudlow rich@nd.edu
Tue, 06 Jan 2009 11:10:07 -0500

Esther Filderman wrote:
> To some degree, OpenAFS will always write slower than standard NFS,
> because AFS is actually making sure it's not writing crap.  NFS will
> happily write stuff at blazingly fast speeds, not caring whether the
> data it writes is sane or corrupted.

The reason NFS appears to be faster is because you're not doing an
apple - apples comparision - if you were you would have to turn off
attribute caching on NFS - at that point you'd find that performance
is essentially equal


> I'm told that you can tell NFSv3 to do error checking and it slows the
> write speed WAY down.  I've never played with it myself (yet).
> On the other hand, you should be able to get a bit more speed out of
> this.  I'll echo what Jason said -- look at upping your chunksize flag
> on afsd.   For a system that's writing lots of large files, sending
> the files over in larger chunks should help.  I would start with -10
> or -12  and work from there.
> Good luck.
> Moose
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Rich Sudlow
University of Notre Dame
Center for Research Computing
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Notre Dame, IN 46556-0539

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