It should be chosen of disk of instances(vms) are on Ceph or each compute node

[TsutomuNakamura]

root@dev-storage01:~# ceph osd lspools
1 volumes
2 backup
3 images
4 vms
5 .mgr

[TsutomuNakamura]

To implement it an instruction below should be run optionally.

dev-storage01 # ceph osd pool create vms 128

[TsutomuNakamura]

dev-storage01 # ceph auth get-or-create client.cinder mon 'allow r' osd 'allow class-read object_prefix rbd_children, allow rwx pool=volumes, allow rwx pool=vms, allow rx pool=images'

↓　↓　↓

dev-storage01 # ceph auth get-or-create client.cinder mon 'allow r' osd 'allow class-read object_prefix rbd_children, allow rwx pool=volumes, allow rx pool=images'

[TsutomuNakamura]

dev-storage01 # ceph auth caps client.cinder mon 'allow r, allow command "osd blacklist"' osd 'allow class-read object_prefix rbd_children, allow rwx pool=volumes, allow rwx pool=vms, allow rx pool=images'

↓　↓　↓

dev-storage01 # ceph auth caps client.cinder mon 'allow r, allow command "osd blacklist"' osd 'allow class-read object_prefix rbd_children, allow rwx pool=volumes, allow rx pool=images'