Hi Mattieu - I'm not sure if a 0 size will work, in fact, if it wasnt designed in it may crash things (I havent looked at this distribution's code in years).
Moreover, the server numbers you're seeing in the example are the servers in the 'stripe' but may not correspond to the logical server numbers that you're thinking of. This is because the '0th' server in the stripe is determined randomly among the set of servers in the filesystem and intentionally changes so as to avoid hitting the same server repeatedly for every file creation, or in the case of many small files that dont fill an entire stripe this prevents uneven distribution of the file handles. Regards, ~Kyle Kyle Schochenmaier On Thu, Feb 7, 2013 at 10:30 AM, Matthieu Dorier <[email protected]>wrote: > Hi Kyle, > > Thank you for the advice, these codes should be indeed a good place to > start. > > Regarding the distribution, I dug a bit and found here > http://www.orangefs.org/doxygen/index.html some functions to set/get > extended attributes (e.g. pvfs_fsetxattr). Then at > http://www.pvfs.org/cvs/pvfs-2-8-branch-docs/doc/pvfs2-tuning/pvfs2-tuning.htmlin > section 7.4 I see a way to set the stripe size on a per-server basis so > I guess I could put 0 for the servers I don't want to use and a positive > value for the servers I want to use. Would that work? > > Thanks, > > Matthieu > > ------------------------------ > > *De: *"Kyle Schochenmaier" <[email protected]> > *À: *"Matthieu Dorier" <[email protected]> > *Cc: *"pvfs2-users" <[email protected]> > *Envoyé: *Jeudi 7 Février 2013 17:05:06 > *Objet: *Re: [Pvfs2-users] Using PVFS2's API directly > > > Hi Matthieu - > > For API examples I would start with looking at the admin tools like > pvfs2-cp, etc as they utilize the libpvfs apis directly. > > I'm not sure if you're able to specify any of the information you want to > on a per-file basis at creation time. > This information is pulled in from the distribution params of the > directory the file is created in. There may be other methods I'm not > immediately thinking of though... I'll let others comment. > > ~Kyle > > Kyle Schochenmaier > > > On Thu, Feb 7, 2013 at 7:05 AM, Matthieu Dorier > <[email protected]>wrote: > >> Hi, >> >> I would like to use the client API provided by PVFS2, without any kernel >> support or MPI-I/O interface. Where can I find documentation and code >> samples of this API? >> Also I'd like to know if there is a way to specify, when creating a file >> (so from within a client application), the list of storage servers to which >> this file should go and the stripe size, in order to bypass the >> configuration of the directory in which the file is created? >> >> Thanks! >> >> Matthieu Dorier >> PhD student at ENS Cachan Brittany and IRISA >> http://people.irisa.fr/Matthieu.Dorier >> >> _______________________________________________ >> Pvfs2-users mailing list >> [email protected] >> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users >> >> > >
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