== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 07:51:38 (1779882698)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       13264     1258040   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17916     1253388   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20564     3586316   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23036     3583844   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170160   1%  /mnt/lustre