https://docs.ceph.com/en/latest/rados/troubleshooting/troubleshooting-pg/
talks about changing 'osd_crush_chooseleaf_type' before creating monitors or OSDs, for the special
case of a 1-node-cluster.
However, the documentation fails to explain how/where to set this option, seeing that with 'cephadm',
there is (almost) no /etc/ceph/ceph.conf anymore.
If you search the web for various errors in Ceph, you will come across clever people explaining you
how to manipulate the DB on the fly, for example "ceph tell mon.* injectargs...".
There should be a paragraph in the documentation mentioning this, along with the corresponding
paragraph on setting options permanently...
In fact, I would just to have the failure domain 'OSD' instead of 'host'.
Any clever way of doing that?
Regards,
Thomas
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