== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 18:54:39 (1787612079)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11556     1259748   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16188     1255116   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30176     3576844   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13376     3593644   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1% /mnt/lustre