== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 12:34:45 (1789144485)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11432     1259872   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16092     1255212   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26132     3580748   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17480     3589512   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43612     7170260   1%  /mnt/lustre