== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 03:36:47 (1788593807)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13500     1257804   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18152     1253152   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20808     3585960   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22764     3584256   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43572     7170216   1% /mnt/lustre