If there are multiple clusters, `dataDirHostPath` must be unique for each cluster. However, it's not documented yet. In addition, `ceph-teardown.md` was also updated because the original document assumes that `dataDirHostPath` is `/var/lib/rook` and the files for a cluster `rook-ceph` is under `/var/lib/rook/rook-ceph`. related issue: https://github.com/rook/rook/issues/14790 Signed-off-by: Satoru Takeuchi <satoru.takeuchi@gmail.com>