== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 02:54:44 (1724309684)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       17992     1269696   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       14832     1272856   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       36212     3570808   2% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14824     3592196   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       51036     7163004   1% /mnt/lustre