== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 12:53:14 (1736790794)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       14892     1272796   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       22024     1265664   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      545380     3061640  16% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      530184     3076836  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1075564     6138476  15% /mnt/lustre