== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 01:45:52 (1788846352)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11392     1259912   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16248     1255056   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24628     3582252   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18956     3587756   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7170008   1% /mnt/lustre