== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 14:21:18 (1787509278)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13328     1257976   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18092     1253212   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22860     3584160   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20692     3586328   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1% /mnt/lustre