On 1/25/24 13:32, Janne Johansson wrote:
It doesn't take OSD usage into consideration except at creation time or OSD in/out/reweighing (or manual displacements with upmap and so 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.
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