== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 01:54:39 (1735368879)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       14984     1272704   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       22264     1265424   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      548556     3058464  16% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      527008     3080012  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1075564     6138476  15% /mnt/lustre