== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 10:48:44 (1786114124)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19332     1251972   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11996     1259308   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23856     3583164   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19692     3587328   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43548     7170492   1%  /mnt/lustre