== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 10:01:09 (1787407269)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11516     1259788   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16172     1255132   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21932     3585088   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21668     3585324   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170412   1%  /mnt/lustre