in my experience a single (or small number) of lfs_find with lots of obd arguments was faster than doing all of them individually.
go to lustre 1.8.4 (at least) and use lfs_migrate with your lfs_find list. it wasn't REAL fast, but it was REAL reliable. bob On 10/6/2010 5:24 PM, Michael Barnes wrote: > Lustre users, > > With lfs find, is it faster/better to do multiple lfs find's with one --obd > or one lfs find with multiple --obd flags? > > I ask, because I made a mistake and ran a lone lfs with a single --obd > argument on an OST that I didn't intend to drain, and the erroneous lfs find > was *much* quicker at migrating data then the lfs find with multiple --obd > flags pointing to different OSTs. > > Is this just a fluke or does lfs find work better with single --obd flag vs > multiple ones? > > Before my mistake, I would assume that they would be the same or that a lfs > find with multiple --obd flags would be faster, but it seems as though the > evidence points to the contrary. > > Does anyone have any experience or knowledge of lfs find and what is the best > way to migrate data off of multiple OST/OSSes? > > TIA, > > -mb > > -- > +----------------------------------------------- > | Michael Barnes > | > | Thomas Jefferson National Accelerator Facility > | Scientific Computing Group > | 12000 Jefferson Ave. > | Newport News, VA 23606 > | (757) 269-7634 > +----------------------------------------------- > > > > > _______________________________________________ > Lustre-discuss mailing list > Lustre-discuss@lists.lustre.org > http://lists.lustre.org/mailman/listinfo/lustre-discuss > > _______________________________________________ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss