== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:43:19 (1784130199)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       15064     1256240   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18784     1252520   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29216     3577804   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15340     3591680   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44556     7169484   1%  /mnt/lustre