== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 07:02:47 (1769083367)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23484     1247820   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20972     1250332   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       25300     3581720   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       19280     3587740   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44580     7169460   1%  /mnt/lustre