This is likely the same problem we have experienced.
When moving to cephfs, it will suddenly use ext4, but the original ZFS has compression. Since proxmox will create a volume with the same outer (!) size, it suddenly wont fit. Say, if the original volume has `100G outer size`, due to...
```
rootfs: pve-blade-108-internal-data:subvol-208-disk-0,size=70G
```
You can check how the volume `pve-blade-108-internal-data` is configured in `/etc/pve/storage.cfg`
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