== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:00:23 (1789992023)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19780     1251524   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       12816     1258488   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24040     3582980   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19560     3587460   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170440   1% /mnt/lustre