== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 10:41:30 (1787841690)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11600     1259704   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16156     1255148   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22636     3584356   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20956     3585868   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7170224   1%  /mnt/lustre