== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 20:25:32 (1746145532)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       19332     1268356   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       17672     1270016   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       25800     3581220   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       17348     3589672   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       43148     7170892   1% /mnt/lustre