Is ceph required to use block devices?

Question

Ceph

1) Is it necessary to use block devices for ceph, can I use a directory?
2) Is it possible to deploy ceph based on openvz containers (i.e. inside an openvz container)?

Answer 1

1) Is it necessary to use block devices for ceph, can I use a directory?

Block device only. Either a partition or the entire disk.
Can. This is a normal program code, it does not matter, in fact, in what environment to work.