== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:52:09 (1789062729)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       15472     1255832   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10248     1261056   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26128     3580612   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17460     3589476   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43588     7170088   1% /mnt/lustre