== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 08:15:12 (1787400912)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210048        8320     2199680   1%  /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       22528     3746816   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       26624     3716096   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7542784       49152     7462912   1%  /mnt/lustre