== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 00:15:13 (1747800913)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       19116     1268572   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       26408     1261280   3% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       27624     3579396   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       17572     3589448   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       45196     7168844   1% /mnt/lustre