== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 11:04:37 (1775228677)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       14784     1256520   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20516     1250788   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       20908     3586112   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       22640     3584380   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43548     7170492   1%  /mnt/lustre