[OpenAFS] Local performance

Michael Loftis mloftis@wgops.com
Mon, 22 Dec 2003 16:40:37 -0700

mmm try using a memory based cache, or a cache on a different 
spindle+channel.  it typically is slower than local I/O ... but not that 

--On Monday, December 22, 2003 14:20 -0500 Dmitri Bichko 
<dbichko@genpathpharma.com> wrote:

> Hello all,
> I've just finished installing an openafs server and a couple of clients,
> and I really quite like it.  However, one area that is really quite
> disappointing is the local performance, ie reading from a volume on the
> same server that it's stored on.
> One use I've envisioned for AFS is the distribution of (rather large)
> database files to several compute machines.  The idea being that he
> databases are downloaded and built on one machine and then just pushed
> out via ro replicas to the rest.
> Unfortunately, I've noticed that sequentially reading a ~.6GB file from
> a locally stored volume is almost 1/10 the speed of reading the same
> file from a regular filesystem on the same machine.
> Is this to be expected?  I assumed that it would be somewhat slower, but
> didn't expect such a large hit.
> Or is something broken with my setup?
> Thanks,
> Dmitri
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Undocumented Features quote of the moment...
"It's not the one bullet with your name on it that you
have to worry about; it's the twenty thousand-odd rounds
labeled `occupant.'"
   --Murphy's Laws of Combat