== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 04:29:37 (1788856177)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       15460     1255844   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9976     1261328   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28972     3577908   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14616     3592012   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43588     7169920   1% /mnt/lustre