[Pvfs2-users] "RAID 1" striping

[Patrick Noffke]

On Fri, Feb 12, 2010 at 9:49 AM, Patrick Noffke <patrick.noffke at gmail.com>wrote:

>
>
> > 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.
>
>
Sorry, I should have read further before posting.  The two-dimensional
stripe should do what I need.  I recall now that I tried this before, but
without the kernel module building, I could not do setfattr to configure
this distribution.  Plus there were the problems I had with MPICH2.  I'll
see if I can get any further now.

Regards,
Patrick
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