== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:44:11 (1787921051)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17724     1253580   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10252     1261052   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24920     3581708   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18664     3588272   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7169980   1% /mnt/lustre