== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:10:06 (1789492206)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17268     1254036   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9740     1261564   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28896     3578040   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14712     3592168   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170208   1% /mnt/lustre