Thanks, Robert, for sharing so many experience! I feel like I don't deserve it :)
I have another but very same situation which I don't understand.
Last time i tried to hard kill OSD daemons.
This time i add a new node with 2 OSDs to my cluster and also monitor the IO. I wrote a script which adds a node with OSDs fully automatically. And seems like when I start the script - an IO is also blocked until the cluster shows HEALTH_OK which takes quite an amount of time. After Ceph status is OK - copying resumes.
What should I tune this time to avoid long IO interuption?
Thanks in advance again :)
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