== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:05:18 (1726855518)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      2210432       17280     2191104   1% /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       29696     3739648   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       26624     3742720   1% /mnt/lustre[OST:1]

filesystem_summary:      7542784       56320     7482368   1% /mnt/lustre