== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:31:15 (1788535875)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17596     1253708   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10208     1261096   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25780     3580848   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17804     3589104   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7169952   1% /mnt/lustre