== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 03:50:46 (1772182246)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17260     1254044   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24512     1246792   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       21672     3585348   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       23380     3583640   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45052     7168988   1%  /mnt/lustre