== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 05:21:46 (1771410106)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17844     1253460   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       16400     1254904   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       20780     3586240   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       22820     3584200   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43600     7170440   1%  /mnt/lustre