== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 08:17:28 (1787833048)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17596     1253708   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10148     1261156   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23720     3583244   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19888     3587104   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170348   1%  /mnt/lustre