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Hi! You can use this "trick" : https://github.com/rook/rook/blob/master/Documentation/direct-tools.md#shared-filesystem-tools This is what I do to directly mount a Cephfs subvolume corresponding to a specific PVC in a VM. In the VM I mount it R/W because that's where I create content, and then the PVC is mounted read only in many Pods (as it's Cephfs it's RWX). As stated in the doc, not suited for production though, as you manipulate CepfFS secret along the way. But it works!
https://github.com/ceph/ceph-csi/blob/devel/docs/static-pvc.md#cephfs-static-pvc