== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:13:26 (1779711206)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       18012     1253292   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10272     1261032   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28900     3577924   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14696     3592212   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43596     7170136   1%  /mnt/lustre