On Oct 19, 2009, at 11:50 AM, Kshitij Mehta wrote:
That raises another question. Is there an API to query existing
striping parameters (stripe size, width) for an existing file
programmatically?
Yes. use PVFS_sys_geteattr with the xattr keys:
user.pvfs2.dist_name
user.pvfs2.dist_params
The dist_params attribute is formated as a string. So you can print
it, or parse it. The format is: <key1>:<value1>,<key2>:<value2>,...
In the default case, the dist_name is going to be "simple_stripe", and
the dist_params will be:
"stripe_size:65536"
You can also query the number of servers used for striping the file
with the attribute:
user.pvfs2.num_dfiles
-sam
On Oct 16, 2009, at 10:15 PM, Rob Ross wrote:
Hi,
Yes you can do this via parameters to PVFS_sys_create().
It would be easiest for you to look at how this is done in ROMIO,
in this file:
src/mpi/romio/adio/ad_pvfs2/ad_pvfs2_open.c
Rob
On Oct 16, 2009, at 9:59 PM, Kshitij Mehta wrote:
Thank you. I know about these options to change the stripe size
(in the config file or using setfattr). But that still doesn't
solve my problem as I need to change the stripe size
programmatically.
Thanks,
Kshitij
On Oct 16, 2009, at 5:12 PM, Kyle Schochenmaier wrote:
Kshitij -
You can modify the stripe size of pvfs2 at run-time : (best to
do it
here or in the config)
http://www.pvfs.org/cvs/pvfs-2-8-branch.build/doc/pvfs2-faq/pvfs2-faq.php
(Chapter 6.6)
Please note that modifications during run-time will only be
propagated
to *NEW* files.
Additionally you can set the distribution params in the config
file.
http://www.pvfs.org/cvs/pvfs-2-8-branch-docs/doc//pvfs-config-options.php
Cheers,
Kyle Schochenmaier
On Fri, Oct 16, 2009 at 5:02 PM, Kshitij Mehta
<[email protected]> wrote:
Hello,
Is there a way to change the stripe size for pvfs2
programmatically? I
remember seeing a C function, but am unable to locate it. My
apologies if
this has been asked before.
Thanks,
Kshitij Mehta
Graduate Student
University of Houston
www.cs.uh.edu/~kmehta
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_______________________________________________
Pvfs2-users mailing list
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Kshitij Mehta
Graduate Student
Parallel Software Technologies Lab
Dept. of Computer Science
University of Houston
USA
www.cs.uh.edu/~kmehta
_______________________________________________
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http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
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