== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 05:04:52 (1787389492)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210176        8448     2199680   1%  /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       23552     3745792   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       26624     3724288   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7470080   1%  /mnt/lustre