== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 02:13:01 (1786428781)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19272     1252032   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11948     1259356   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21984     3585036   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21616     3585376   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170412   1%  /mnt/lustre