== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 12:16:44 (1790785004)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19228     1252076   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11708     1259596   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30092     3576788   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13512     3593424   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170212   1% /mnt/lustre