root@graphite jcb]# dmsetup status

 dmcache: 0 1366552543 cache 8 12468/17920 512 4653/4194304 1488021 200791
 2189199 41931 0 4650 0 1 writeback 2
 migration_threshold 2048 mq 10
 random_threshold 4 sequential_threshold 512
 discard_promote_adjustment 1
 read_promote_adjustment 4 write_promote_adjustment 8
 fedora-home: 0 199393280 linear