== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 15:29:14 (1788982154)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17344     1253960   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10004     1261300   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24072     3582948   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19512     3587256   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7170204   1% /mnt/lustre