Hi John,
On Jul 26, 2011, at 1:51 PM, John Knutson wrote:
> Hi Albert, thanks for the response...
>
> Albert Cheng wrote:
>> Parallel I/O is a different issue. It depends what parallel file systems
>> you use.
>> Two commercial systems, GPFS (by IBM) and Lustre (now owned by Oracle)
>> are possible options. Their performance varies and are highly
>> dependent on the characteristics of the I/O pattern of your applications.
> Unfortunately I had some misconceptions in my thinking. To do parallel I/O,
> HDF5 apps actually need to set up an MPI file access property list, which
> would be in exclusion to any other FAPL type (e.g. sec2, direct, etc.). Is
> that correct?
Yes, that's correct. (Since the "bottom" layer needs to make MPI-I/O
calls, instead of POSIX, etc)
Quincey
> We are currently doing writes using the iRODS VFD I developed, though reading
> apps are using the (potentially faster) sec2 driver.
>
>
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