== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 18:19:30 (1789078770)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       15608     1255696   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10092     1261212   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30220     3576716   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13376     3593392   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43596     7170108   1% /mnt/lustre