== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 01:28:14 (1781242094)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19196     1252108   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11820     1259484   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21792     3585088   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21808     3585128   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170216   1%  /mnt/lustre