== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 20:42:56 (1787704976)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17768     1253536   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10108     1261196   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30984     3576036   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12568     3594452   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1% /mnt/lustre