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Ceph fails after power loss: SLOW_OPS, OSDs flip between down and up

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Dear all,

after a short power loss, my cluster of three nodes is not coming up again.
System facts: Proxmox 8.3.3, Ceph Reef 18.2.4, each node 3 SSDs (4TB SATA, 2TB NVME, 1TB SATA with a OSD partition) with 3 OSD, so a total of 9 OSDs.
The system tries to activate the OSDs, then decides that ALL OSDs of a node are too bad and calls them down.
I've tried to disable down-ing of the OSDs, but the system does not show any signs of recovery.

root@f4:~# ceph health
HEALTH_WARN 6 osds...

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