[no subject]

Greg Freemyer wrote:

>Attriel,
>
>I assume you know that what you are doing is simply not supported by
>most filesystems, right?
>
>The "correct" thing to do would be to try a cluster filesystem. 
>
>For what you describe, I think GFS from Redhat or OCFS from Oracle
>would be the best GPL choices.  Both are designed  to have multiple
>nodes accessing a common shared storage array.
>
>Unfortunately neither of these is likely to be as fast as XFS.  
>
>I would check out OCFS first.  It has some short-comings (no locking,
>no acls, etc.),  but I don't think you need those features.
>
>If you need XFS, you could also try mounting with the sync flag.  That
>tells xfs to keep the servers write buffer flushed to disk at all
>times.  Unfortunately, the sync flag really slows down XFS's
>performance.
>
>That would fix your write caching issues.
>
>As Dow said, it is your read cache that is likely the real difficulty.
> Maybe you could post on the XFS list and someone could tell you of
>way to invalidate all the read cache pages, thus forcing a physical
>read.  If that could be done every 30 seconds or so, it might work for
>you.
>
>Greg
>  
>


</pre>
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