== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 06:02:31 (1787479351)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11644     1259660   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16252     1255052   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29036     3577984   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14568     3592452   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1%  /mnt/lustre