[Pvfs2-users] "RAID 1" striping

[Patrick Noffke]

On Fri, Feb 12, 2010 at 9:36 AM, Emmanuel Florac <eflorac at intellique.com>wrote:

> Le Fri, 12 Feb 2010 09:24:23 -0600
> Patrick Noffke <patrick.noffke at gmail.com> écrivait:
>
> > Is it possible to configure pvfs to use striping similar to RAID 1?
>
> Striping is RAID 0, RAID is mirroring. Which one exactly do you want?
>

Sorry, I meant mirroring.


>
> > I have a need for very fast file read times with MPI, and I was
> > thinking pvfs with this type of striping could help.
>
> This is what pvfs is made for...
>
>
Could you elaborate more on that please?  Is the striping of pvfs faster
than local file I/O, or is there a mirroring capability?  As far as I could
tell, the tuning document does not mention any mirroring option.

I have not been able to do performance testing yet with pvfs vs. local file
I/O.  I first tried pvfs with MPICH2, and I was getting crashes when sending
data between nodes (regardless of whether I used pvfs or local files).  Then
I tried openmpi, but I could not get that to work with pvfs.  I ended up
just going with local files and openmpi so I could get the test running.  I
had to put it on the back burner for a while, but I'm able to spend more
time on this now so I'd like to revisit using pvfs.

Kind regards,
Patrick
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