== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 21:40:11 (1768012811)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       18204     1253100   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       27788     1243516   3%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       30024     3576940   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       15644     3591208   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45668     7168148   1%  /mnt/lustre