Hi! 
I can not understand the meaning of the parameter hit_set_period. This is the 
minimum time then begin flush changed data from cache to based pool?  Or this 
time after which the not changed data is deleted from cache pool?
For example: there is a pool main_pool on 4 OSD and ssd_pool on ssd disk. I set 
the cache ssd_pool  for main_pool and set hit_set_period 3600. Begin write a 
virtual machine to main_pool. After some time the image of the virtual  machine 
will be located on the main pool? I want know, what period of time i lost data 
then ssd will break.
Thank
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