== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 14:32:35 (1785090755)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11324     1259980   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16132     1255172   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22796     3584224   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20756     3586264   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1%  /mnt/lustre