== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 08:48:27 (1741697307)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       19888     1267800   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       17028     1270660   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      544472     3062548  16% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      531096     3075924  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1075568     6138472  15% /mnt/lustre