== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 02:25:41 (1786947941)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210176        9472     2198656   1%  /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       22528     3739648   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       26624     3738624   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7542784       49152     7478272   1%  /mnt/lustre