Hi All, I have RADOS gw(rgw) ceph cluster (v18.2.1) applied Erasure Coding and 10009 shards to save a lot of objects in a bucket root:/home/ceph# ceph osd df ID CLASS WEIGHT REWEIGHT SIZE RAW USE DATA OMAP META AVAIL %USE VAR PGS STATUS 0 hdd 0.00490 1.00000 5.0 GiB 318 MiB 58 MiB 1 KiB 260 MiB 4.7 GiB 6.21 0.94 143 up 1 hdd 0.00490 1.00000 5.0 GiB 330 MiB 56 MiB 2 KiB 274 MiB 4.7 GiB 6.45 0.98 155 up 2 hdd 0.00490 1.00000 5.0 GiB 372 MiB 60 MiB 1 KiB 313 MiB 4.6 GiB 7.28 1.10 148 up (The osds are just data pool, it's not index pool for rgw..I think a lot of shards are not impact data pool META size) the OSD META occupied same as data size. I know that OSD META is rocksdb. I think oversized even though rocksdb META is needed. I can use osd compact to decrease META size. but I want to know why OSD META size is big than I expect, Is there way to decrease the META size by changing parameter instead of osd compact? I guess that some of "bluestore_rocksdb_options" can impact the META size. And let me know if you need the other parameter of ceph cluster to figure out the symptom.