== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 04:25:20 (1785399920)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210048        7552     2200448   1%  /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       23552     3741696   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       25600     3738624   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7542784       49152     7480320   1%  /mnt/lustre