== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 23:49:30 (1784087370)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17192     1254112   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       20160     1251144   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       27848     3579172   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17820     3589200   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45668     7168372   1%  /mnt/lustre