Hi,

although there is already a section in the upstream docs about mon store recovery using OSDs [0], I decided to write a blog post [1] with more details especially wrt cephadm managed clusters.

I tested the procedure multiple times on two different lab clusters and it worked every time. Although I hope that nobody will have to use it (I doubt it though), I do hope that this will help speed up recovery.
Maybe the upstream docs could be extended a bit as well.

Although I have tested it extensively I may have forgotten something or made a mistake somewhere. I'd appreciate comments if you find anything like that.

Have a great rest of the weekend!

Eugen


[0] https://docs.ceph.com/en/latest/rados/troubleshooting/troubleshooting-mon/#recovery-using-osds [1] https://heiterbiswolkig.blogs.nde.ag/2026/06/28/cephadm-recover-mon-store-using-osds/
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