== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 20:33:28 (1746146008)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       16044     1271644   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21844     1265844   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       30940     3576080   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       12224     3594796   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       43164     7170876   1% /mnt/lustre