== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:50:58 (1788630658)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17508     1253796   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10200     1261104   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25988     3581032   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17568     3589452   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1% /mnt/lustre