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In this case, cinder just is a front-end storage: is a connector from vm client to a back-end storage. ceph is a back-end storage: where to store data.

If you don't want to use ceph as a back-end storage, there're a lot of candidates like as: glusterfs, nfs, iscsi ...

By default, cinder uses the local-volume like as a back-end storage through iscsi ... you need to change cinder config if you want to use another.

Depends on your purpose and your infrastructure system which you own, select a corresponding candidate. if you want to build a distributed storage for large scale, i recommend you use ceph.

And for small scale, you can use local disk as a back-end storage..