== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 04:59:59 (1761296399)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       20928     1250376   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       17344     1253960   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       25852     3581168   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       17708     3589312   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43560     7170480   1%  /mnt/lustre