== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 06:01:12 (1731754872)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       15008     1272680   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       22064     1265624   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      538284     3068736  15% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      537248     3069772  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1075532     6138508  15% /mnt/lustre