On Wed, Mar 15, 2017 at 09:36:24AM -0400, Stephen Ulmer wrote: > What’s the average file size? Every file that is less than *about* 3.5K will > wind up in the (4k) inode itself.
average file size is about 4MB. > Also check the HW sector size of the SSDs (many are 4K now). If that’s the > case, you’ll actually be much more efficient from an access point of view > with 4K inodes. HW sector size reported by disk array is 512B. SSD itself uses 4k though, however, Linux thinks it is only 512B. > If you don’ t have 1PB of data yet (or won’t in the next year or so), you can > always expand the system pool with more SSDs in the future. I cannot. I don't have free HW slots. > It’s not scary to pick another size — it works just fine, but you’re about to > create a filesystem that will be a pain in the rear to change. It will take a > long time to move/backfill even a few hundred TB of data if you change you > mind later. You’ll definitely give up (possibly future) features by choosing > not 4K, but you’ve got the flexibility to do so. :) But at least I will have space to store metadata :) -- Lukáš Hejtmánek _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
