== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 18:06:21 (1741903581)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       21800     1265888   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19876     1267812   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      540840     3066180  15% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      535444     3071576  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1076284     6137756  15% /mnt/lustre