root@controller11:/home/ceph/bin# cat /proc/diskstats
   1       0 ram0 0 0 0 0 0 0 0 0 0 0 0
   1       1 ram1 0 0 0 0 0 0 0 0 0 0 0
   1       2 ram2 0 0 0 0 0 0 0 0 0 0 0
   1       3 ram3 0 0 0 0 0 0 0 0 0 0 0
   1       4 ram4 0 0 0 0 0 0 0 0 0 0 0
   1       5 ram5 0 0 0 0 0 0 0 0 0 0 0
   1       6 ram6 0 0 0 0 0 0 0 0 0 0 0
   1       7 ram7 0 0 0 0 0 0 0 0 0 0 0
   1       8 ram8 0 0 0 0 0 0 0 0 0 0 0
   1       9 ram9 0 0 0 0 0 0 0 0 0 0 0
   1      10 ram10 0 0 0 0 0 0 0 0 0 0 0
   1      11 ram11 0 0 0 0 0 0 0 0 0 0 0
   1      12 ram12 0 0 0 0 0 0 0 0 0 0 0
   1      13 ram13 0 0 0 0 0 0 0 0 0 0 0
   1      14 ram14 0 0 0 0 0 0 0 0 0 0 0
   1      15 ram15 0 0 0 0 0 0 0 0 0 0 0
   7       0 loop0 0 0 0 0 0 0 0 0 0 0 0
   7       1 loop1 0 0 0 0 0 0 0 0 0 0 0
   7       2 loop2 0 0 0 0 0 0 0 0 0 0 0
   7       3 loop3 0 0 0 0 0 0 0 0 0 0 0
   7       4 loop4 0 0 0 0 0 0 0 0 0 0 0
   7       5 loop5 0 0 0 0 0 0 0 0 0 0 0
   7       6 loop6 0 0 0 0 0 0 0 0 0 0 0
   7       7 loop7 0 0 0 0 0 0 0 0 0 0 0
   8       0 sda 44965 2285 832572 236968 121721 77586 12904136 1460984 0 932536 1697736
   8       1 sda1 533 164 5570 3112 20 11 248 116 0 2992 3224
   8       2 sda2 44267 2118 825658 233252 96397 77575 12903888 915856 0 411176 1148912
 252       0 dm-0 46187 0 822738 341860 176749 0 12903888 1705992 0 932368 2047848
 252       1 dm-1 290 0 2320 1608 0 0 0 0 0 1112 1608
  11       0 sr0 0 0 0 0 0 0 0 0 0 0 0
 251       0 rbd0 2080 90244 101090 467044 355 0 107597 12364 0 466928 479400
 251       1 rbd0p1 1307 90215 94710 15328 354 0 107589 12360 0 15216 27688
 250       0 rbd1 6399 185335 1529091 27200 350 0 103493 13584 0 26944 40780
 249       0 rbd2 169 0 1352 108 0 0 0 0 0 108 108
 248       0 rbd3 169 0 1352 104 0 0 0 0 0 104 104
 247       0 rbd4 169 0 1352 100 0 0 0 0 0 100 100