== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 23:45:44 (1789789544)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13504     1257800   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18316     1252988   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25852     3581168   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17704     3589316   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1% /mnt/lustre