== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 06:41:50 (1787136110)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11348     1259956   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16232     1255072   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28992     3578000   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14612     3592352   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170352   1%  /mnt/lustre