== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 12:05:26 (1729094726)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       18008     1269680   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24364     1263324   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      548056     3058964  16% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      528512     3078508  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1076568     6137472  15% /mnt/lustre