== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 12:04:07 (1722787447)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       21096     1266592   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19700     1267988   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       35944     3571076   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15672     3591348   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       51616     7162424   1% /mnt/lustre