read:
sb          :       86016
journal     :           0
btree       :2767671263232
user        :553932742656
cached      :           0
parity      :           0
stripe      :           0
need_gc_gens:           0
need_discard:           0
unstriped   :           0
write:
sb          :      645120
journal     :2432028966912
btree       :782753624064
user        :383826411520
cached      :           0
parity      :           0
stripe      :           0
need_gc_gens:           0
need_discard:           0
unstriped   :           0
