Just to share with the rest of the list, my problems have been solved now. I got this information from Sergey Malinin who had the same problem:
1. Stop OSD daemons on all nodes. 2. Check the output of "ceph osd tree". You will see some of OSDs showing as "up" - shut them down using "ceph osd down osd.X" 3. Start OSD daemons on all nodes - your cluster should now become operational. It is probably the "mon_osd_min_up_ratio" that messed up my upgrade. I am happily running Infernalis now. Thanks all for the help and effort. /Claes
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