read:
sb          :       86016
journal     :           0
btree       :  2193358848
user        :3770452246528
cached      :           0
parity      :           0
stripe      :           0
need_gc_gens:           0
need_discard:           0
unstriped   :           0
write:
sb          :      645120
journal     :           0
btree       :      589824
user        :6258285805568
cached      :           0
parity      :           0
stripe      :           0
need_gc_gens:           0
need_discard:           0
unstriped   :           0
