== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 18:40:54 (1755643254)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       15568     1272120   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21660     1266028   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       23100     3583920   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       21436     3585584   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44536     7169504   1% /mnt/lustre