== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 09:26:02 (1724765162)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       21140     1266548   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19556     1268132   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       27716     3579304   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       24868     3582152   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       52584     7161456   1% /mnt/lustre