== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 11:29:05 (1785770945)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19312     1251992   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11904     1259400   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24036     3582928   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19568     3587396   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170324   1%  /mnt/lustre