== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 00:02:05 (1788926525)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17252     1254052   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9832     1261472   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25768     3580972   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17828     3589108   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43596     7170080   1% /mnt/lustre