thanks josh , my cluster is octopus on hdd (for testing) ,so i have to re-create OSDs and change bluestore_min_alloc_size before creating OSDs ? Is this normal that my rbd pool does not having size amplification ? > Hey Seb, > >> I have a test cluster on which I created pools rbd and cephfs (octopus), when >> I copy a directory containing many small files on a pool rbd the USED part of >> the ceph df command seems normal on the other hand on cephfs the USED part >> seems really abnormal, I tried to change the blocksize >> bluestore_min_alloc_size but it didn't change anything, would the solution be >> to re-create the pool or outright the OSDs? > > bluestore_min_alloc_size has an effect only at OSD creation time; if > you changed it after creating the OSDs, it will have had no effect > yet. If your pool is on HDDs and this is pre-Pacific, then the default > of 64k will have a huge amplification effect for small objects. > > Josh
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