Yeah it’s the i.a fault 
I trusted the tools and they got worse and worse. But at the same time, I should have thought about it a little more…
Yes, I did this [Tech Preview] Hashstore backend for storage nodes - #567 by jammerdan
and this then this [Tech Preview] Hashstore backend for storage nodes - #569 by Alexey .
I think it is working because I have log file in hashstore in s0 and s1, more the 20 GO for now.
But I don’t move them to the ssd for now.