== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 20:47:43 (1743209263)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       21168     1266520   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19220     1268468   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       25380     3581640   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       18800     3588220   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44180     7169860   1% /mnt/lustre