== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 03:25:57 (1788679557)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13088     1258216   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16036     1255268   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20708     3586116   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22900     3584036   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170152   1% /mnt/lustre