== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 13:43:33 (1772909013)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210432       14080     2194304   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       25600     3736576   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       28672     3738624   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       54272     7475200   1%  /mnt/lustre