I'm getting a error:
$ ceph osd tier set-overlay data data-cache
Error EBUSY: pool 'data' is in use by CephFS via its tier
From what I can see in the code, that comes from OSDMonitor::_check_remove_tier; I don't understand why set-overlay needs to call _check_remove_tier. A quick look makes it look like set-overlay will always fail once MDS has been set up. Is this a bug, or am I doing something wrong?
Scott
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