== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:54:37 (1787626477)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13052     1258252   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17980     1253324   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25896     3581124   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17708     3589312   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1% /mnt/lustre