== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 13:58:54 (1772477934)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23392     1247912   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20312     1250992   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       27100     3579920   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       18516     3588504   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45616     7168424   1%  /mnt/lustre