== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 16:58:20 (1790110700)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17244     1254060   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9532     1261772   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32140     3574796   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11452     3595148   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7169944   1% /mnt/lustre