== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 07:49:29 (1773661769)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       25588     1245716   3%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       22564     1248740   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       30888     3576132   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       14780     3592240   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45668     7168372   1%  /mnt/lustre