== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:39:51 (1787585991)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19576     1251728   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11940     1259364   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       27832     3578880   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15764     3591172   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43596     7170052   1% /mnt/lustre