== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 07:33:39 (1744025619)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       17252     1270436   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       23876     1263812   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       22204     3584816   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       21960     3585060   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44164     7169876   1% /mnt/lustre