read:
sb          :       86016
journal     :           0
btree       :     8912896
user        :610019098624
cached      :           0
parity      :           0
stripe      :           0
need_gc_gens:           0
need_discard:           0
unstriped   :           0
write:
sb          :      677376
journal     :           0
btree       :           0
user        :562070339584
cached      :           0
parity      :           0
stripe      :           0
need_gc_gens:           0
need_discard:           0
unstriped   :           0
