== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 01:58:29 (1781243909)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11316     1259988   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16192     1255112   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29976     3577044   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13628     3593392   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1%  /mnt/lustre