[Pvfs2-users] Changing stripe size programmatically

[Kshitij Mehta]

Thank you Rob. I did take a look at ad_pvfs2_open, but will have to  
look in detail to understand the parameters being passed to it, since  
I am not well versed with the underlying source code for pvfs2 or MPICH.

I still have a couple of questions:
1. Is there an API that describes the PVFS functions? If I could take  
a look at the API for pvfs_sys_create, it will make life simpler for me.
2. Can one change the stripe size of an existing file programmatically?

Thanks,
Kshitij

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 <kvm1983 at gmail.com>  
>>> 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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>>>>
>>
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