Den tors 25 jan. 2024 kl 17:47 skrev Robert Sander <r.san...@heinlein-support.de>: > > forth), so this is why "ceph df" will tell you a pool has X free > > space, where X is "smallest free space on the OSDs on which this pool > > lies, times the number of OSDs". Given the pseudorandom placement of > > objects to PGs, there is nothing to prevent you from having the worst > > luck ever and all the objects you create end up on the OSD with least > > free space. > > This is why you need a decent amount of PGs, to not run into statistical > edge cases.
Yes, just take the experiment to someone with one PG only, then it can only fill one OSD. Someone with a pool with only 2 PGs could at the very best case only fill two and so on. If you have 100+ PGs per OSD, the chances for many files to end up only on a few PGs becomes very small. -- May the most significant bit of your life be positive. _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
