== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 03:50:29 (1769763029)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       24868     1246436   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19992     1251312   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       30816     3576204   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       14684     3592336   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45500     7168540   1%  /mnt/lustre