== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 18:42:43 (1788475363)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11100     1260204   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16196     1255108   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28180     3578364   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15468     3591552   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43648     7169916   1% /mnt/lustre