Setting up my first ceph cluster using proxmox. A few question

May 21, 2020
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When I try to create an OSD, Proxmox UI asks for

* Data disk
* DB disk
* WAL disk

What disk will be the limiting factor in terms of storage size for my OSD - the data disk?
How large do I need to make the other two?

Is there a risk of them running over capacity before the capacity of the OSD is reached? If so, how to avoid this (in terms of usage pattern)?