Configuration: rbd - erasure pool rbdtier - tier pool for rbdceph osd tier add-cache rbd rbdtier 549755813888 ceph osd tier cache-mode rbdtier writeback Create new rbd block device: rbd create --size 16G rbdtest rbd feature disable rbdtest object-map fast-diff deep-flatten rbd device map rbdtest And fill in rbd0 by data (dd, fio and like). Remove rbd block device: rbd device unmap rbdtest rbd rm rbdtest And now pool usage look like: POOLS: NAME ID USED %USED MAX AVAIL OBJECTS rbd 9 16 GiB 0 0 B 4094 rbdtier 14 104 KiB 0 1.7 TiB 5110
Avoid cache-tier configurations. Write rbd objects to EC pool directly since luminous clients.
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