[PVFS2-users] using ROMIO interface

[Weikuan Yu]

Hi,

Can anybody provide a pointer about some guide to run ROMIO over 
PVFS/PVFS2 in user space, i.e., without VFS support?

Many thanks in advance,

Weikuan

On Aug 17, 2004, at 5:03 PM, Robert Latham wrote:

> On Tue, Aug 17, 2004 at 10:54:28PM +0200, Stefano TLC185 wrote:
>> I installed PVFS2, as a non-priviledged user, because I want to use
>> PVFS2 only with the ROMIO interface.  I created a directory named
>> $HOME/pvfs2/volume and I edited my pvfs2tab  file, then I set the
>> variable $PVFS2TAB_FILE.  Now, if I use the file system with the
>> pvfs2-apps (like pvfs2-ls  pvfs2-cp etc...) everything works
>> correctly, but when I run an mpi  process that use mpi-io (note that
>> I installed mpich2 0.97) and I  specify for example the file
>> $HOME/pvfs2/volume/test, it creates file  in the VFS volume of my
>> system and not in the pvfs2 file system. Should  I specify to ROMIO
>> what is the file system to use? How can I send this  information to
>> ROMIO? Should I specify the file system as a protocol  (like
>> pvfs2:$HOME/pvfs2/volume ) ?
>
> You're close.
>
> If i understand you correctly, you have the pvfs2 storage space in
> ${HOME}/pvfs2/volume.  What is the "mountpoint" in your pvfs2tab file?
>
> For example, if this is my pvfs2tab file:
> tcp://leela:3349/pvfs2-fs /pvfs2 pvfs2 defaults 0 0
>
> the mountpoint is 'pvfs2'
>
> then I would pass "pvfs2:/pvfs2/filename" to ROMIO if i wanted to
> create a file on the pvfs2 volume.
>
> Does that clear things up?
> ==rob
>
>
> -- 
> Rob Latham
> Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
> Argonne National Labs, IL USA                B29D F333 664A 4280 315B
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