== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 03:37:18 (1769762238)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23800     1247504   2%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3833116       23100     3583920   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       21224     3585796   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44324     7169716   1%  /mnt/lustre