== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 13:46:46 (1786988806)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19436     1251868   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11732     1259572   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22036     3584900   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21568     3585396   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170296   1%  /mnt/lustre