I was using Hammer on some clients and Jewel on others, even though is it NOT recommended.

I'd like to recommend you to tripe check your rbd_default_features in case you are mixing versions. This options isn't docummented well and it is easy to miss it. I understand reasons for this change, agree with it and just wanted to inform you since I may help somebody.

Hammer: rbd_default_features = 3
Jewel: rbd_default_features = 61

You will not be able to mount volume with Hammer if you create it with Jewel.

I wasn't successful trying to find table with indexes of features ... does anybody know?

Happy Cephing!

Tom Kukrál

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