== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 04:51:31 (1779699091)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17848     1253456   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10428     1260876   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20588     3586348   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23000     3583908   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43588     7170256   1%  /mnt/lustre