The pool *default.rgw.buckets.data* has *501 GiB* stored, but USED shows *3.5 TiB *(7 times higher!)*:* root@ceph-01:~# ceph df --- RAW STORAGE --- CLASS SIZE AVAIL USED RAW USED %RAW USED hdd 196 TiB 193 TiB 3.5 TiB 3.6 TiB 1.85 TOTAL 196 TiB 193 TiB 3.5 TiB 3.6 TiB 1.85 --- POOLS --- POOL ID PGS STORED OBJECTS USED %USED MAX AVAIL device_health_metrics 1 1 19 KiB 12 56 KiB 0 61 TiB .rgw.root 2 32 2.6 KiB 6 1.1 MiB 0 61 TiB default.rgw.log 3 32 168 KiB 210 13 MiB 0 61 TiB default.rgw.control 4 32 0 B 8 0 B 0 61 TiB default.rgw.meta 5 8 4.8 KiB 11 1.9 MiB 0 61 TiB default.rgw.buckets.index 6 8 1.6 GiB 211 4.7 GiB 0 61 TiB default.rgw.buckets.data 10 128 501 GiB 5.36M 3.5 TiB 1.90 110 TiB The *default.rgw.buckets.data* pool is using erasure coding: root@ceph-01:~# ceph osd erasure-code-profile get EC_RGW_HOST crush-device-class=hdd crush-failure-domain=host crush-root=default jerasure-per-chunk-alignment=false k=6 m=4 plugin=jerasure technique=reed_sol_van w=8 If anyone could help explain why it's using up 7 times more space, it would help a lot. Versioning is disabled. ceph version 15.2.13 (octopus stable). Sincerely, Ark.