Ceph, create OSD and no disks unused (greyed out)

Hi All,
I have 4 nodes in a cluster
Node 2 is the primary node and I can add disks (create OSD) connected to this node with no problems.

The other 3 nodes all have spare SSD drives but none of them will appear when I try to add an OSD

when I try to destroy the contents I get this

root@prox4:~# ceph-volume lvm zap /dev/sdb --destroy
--> Zapping: /dev/sdb
Running command: /usr/sbin/wipefs --all /dev/sdb
stderr: wipefs: error: /dev/sdb: probing initialization failed: Device or resource busy...

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