== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:55:04 (1788623704)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19236     1252068   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11852     1259452   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29084     3577936   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14492     3592360   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43576     7170296   1% /mnt/lustre