Configuration:
rbd - erasure pool
rbdtier - tier pool for rbd
ceph 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.
k
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