Dear folks,

I had a strange situation with 3-node Ceph cluster on Luminous 12.2.12 with 
bluestore. Each machine has 5 OSDs on HDD, and each OSD uses a 30GB DB/WAL 
partition on SSD. At the beginning without much data, OSDs can quickly up if 
one node restarts. 

Then I ran 4-day long stress tests with vdbench, and then I restarts one node, 
and to my surprise, OSDs on that node takes ca 15 minutes to turn into up 
state. How can i speed up the OSD UP process ?


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