== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 18:57:54 (1788476274)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17676     1253628   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10320     1260984   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30920     3576072   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12636     3594384   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170456   1% /mnt/lustre