== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 16:28:35 (1761251315)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       14192     1257112   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19352     1251952   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       25792     3581228   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       17808     3589212   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43600     7170440   1%  /mnt/lustre