We have Lustre v 1.6.7, so I don't think we have OST pools. We have an application that generates a few files. We wanted to test the performance over a subset of OSTs. However, we end up hitting all OSTs, since the different files get created over a different set of OSTs.
Thanks for your reply, Kshitij Mehta PhD Candidate Parallel Software Technologies Lab (pstl.cs.uh.edu) Dept. of Computer Science University of Houston Houston, Texas, USA -----Original Message----- From: Wynkoop, John Louis [mailto:[email protected]] Sent: Thursday, February 09, 2012 7:39 PM To: Kshitij Mehta Subject: Re: [Lustre-community] Create directory where files get striped over the same set of OSTs Kshitij, You can consider using stripe offsets (IE: lfs setstripe -i 0), this will configure Lustre to start the striping on the same OST each time. To keep the files confined to a certain set of OSTs, you should look into OST pools. You didn't mention your version of Lustre, but anything 1.8 or later should have support for pools. Just out of curiosity, why do you want to limit which OSTs you are using? That will greatly affect the usage balance across your OSTs and reduce your total throughput. Hope this helps. -- John Wynkoop HPC System Administrator National Institute for Computational Sciences The University of Tennessee, Knoxville email: [email protected] On 2/9/12 6:24 PM, "Kshitij Mehta" <[email protected]> wrote: >Hello, >My lustre installation has a total of 64 OSTs and I have created a >directory that has been configured over 8 OSTs. >However, files in this directory get striped over different OSTs. For >example, >file 1 might get striped over OSTs 0 thru 7, whereas file 2 might get >striped over OSTs 8 thru 15. > >How can I configure a directory so that files in it get striped across >the *same* set of OSTs? > >Thanks, >Kshitij Mehta >PhD candidate >Parallel Software Technologies Lab (pstl.cs.uh.edu) >Dept. of Computer Science >University of Houston >Houston, Texas, USA >_______________________________________________ >Lustre-community mailing list >[email protected] >http://lists.lustre.org/mailman/listinfo/lustre-community > _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
