== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:33:00 (1763407980)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210304       10496     2197760   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       21504     3743744   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       26624     3737600   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       48128     7481344   1%  /mnt/lustre