== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:05:12 (1746155112)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       15948     1271740   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21768     1265920   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       28636     3578384   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       14528     3592492   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       43164     7170876   1% /mnt/lustre