== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 02:17:18 (1734679038)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       19256     1268432   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       16248     1271440   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      538136     3068884  15% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      536900     3070120  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1075036     6139004  15% /mnt/lustre