On Fri, Feb 12, 2010 at 9:36 AM, Emmanuel Florac <eflo...@intellique.com>wrote:
> Le Fri, 12 Feb 2010 09:24:23 -0600 > Patrick Noffke <patrick.nof...@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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