== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:26:44 (1788697604)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       20332     1250972   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       14452     1256852   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29368     3577652   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15208     3591812   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44576     7169464   1% /mnt/lustre