== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:58:24 (1734119904)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       18672     1269016   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24632     1263056   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      540808     3066212  15% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      535804     3071216  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1076612     6137428  15% /mnt/lustre