== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 06:10:04 (1726308604)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       13628     1274060   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20780     1266908   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      543508     3063512  16% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      532028     3074992  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1075536     6138504  15% /mnt/lustre