Thank you Becky and Elaine for your replies. Actually, I have no problem with this particular behavior. I just noticed that it contrasted with what is available in the documentation.
Best, On Wed, Sep 7, 2016 at 7:34 PM Elaine Quarles <[email protected]> wrote: > Eduardo, > > We have confirmed that if file stuffing is turned off, servers to store > the data are allocated as you expect in a round robin fashion. If file > stuffing is turned on, then the order of servers is not guaranteed. > > If your use case depends on round robin, you can turn off stuffing by > modifying the config file as shown below and restarting your servers. > > <Filesystem> > ... > FileStuffing no > ... > </Filesystem> > > Hope that helps! > Elaine > > > On Tue, Sep 6, 2016 at 5:49 PM, Becky Ligon <[email protected]> wrote: > >> Eduardo: >> >> Looks like you have uncovered a bug. So far, we have found the problem >> as far back as 2.8.4. We are still investigating and will keep you posted. >> >> thanks! >> Becky Ligon >> >> On Tue, Sep 6, 2016 at 3:34 PM, Eduardo CAMILO Inacio < >> [email protected]> wrote: >> >>> Dear PVFS2 users, >>> >>> After performing some experiments on OrangeFS 2.8.8, I am a little >>> confused about the default distribution layout. Systems manual, change log, >>> and some published papers claim that it should be ROUND_ROBIN. By that, I >>> understand that a server is randomly chosen to store the first 64 KB of the >>> file, and the second 64 KB block would be stored in the next server >>> according to the order in the configuration file, and so on. >>> >>> In my experiments, what I am observing is more close to the behavior I >>> would expect with a RANDOM layout. For instance, when two out of four >>> servers are chosen to store objects from a file, independently if the >>> "user.pvfs2.num_dfiles" is set to 2 or if the file size is just 2x the >>> stripe size, it seems like the two servers are being chosen randomly. >>> >>> It is worth noting that no change was performed in the generated config >>> file; the number of data files is changed through setfattr commands before >>> experiments. POSIX requests are being generated using the IOR benchmark >>> v3.0.1 with MPICH 3.2, which, I am assuming, is not changing the layout of >>> the file system. >>> >>> Attached, you will find some output that illustrate the aforementioned >>> behavior. >>> >>> Any insight on this subject would be helpful. >>> >>> Best, >>> -- >>> Eduardo Camilo Inacio >>> >>> _______________________________________________ >>> Pvfs2-users mailing list >>> [email protected] >>> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users >>> >>> >> >> _______________________________________________ >> Pvfs2-users mailing list >> [email protected] >> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users >> >> > -- Eduardo Camilo Inacio
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