== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:17:11 (1789147031)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17376     1253928   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9936     1261368   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25872     3580756   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17720     3589188   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7169944   1%  /mnt/lustre