== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:54:08 (1775879648)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23652     1247652   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21080     1250224   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       27160     3579860   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       17412     3589608   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44572     7169468   1%  /mnt/lustre