== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 06:50:39 (1786704639)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17596     1253708   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10032     1261272   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26840     3580152   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16764     3590256   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170408   1%  /mnt/lustre