== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 15:29:21 (1758828561)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       15900     1271788   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       22252     1265436   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       29364     3577656   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       15176     3591844   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44540     7169500   1% /mnt/lustre