[Pvfs2-users] Changing stripe size programmatically

[belcampo]

Kshitij Mehta wrote:
> 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?
I think by making a copy of it and then a mv -f newstripesize.file 
oldstripesize.file you'll get what you want.
> 
> 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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>>>>> Pvfs2-users at beowulf-underground.org
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>>>>>
>>>
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> 
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