== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 02:33:29 (1788849209)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17520     1253784   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10032     1261272   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20956     3585588   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22636     3584300   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7169888   1% /mnt/lustre