== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 02:51:29 (1733644289)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      2210432       25088     2183296   2% /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       30720     3738624   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       25600     3743744   1% /mnt/lustre[OST:1]

filesystem_summary:      7542784       56320     7482368   1% /mnt/lustre