== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 15:06:18 (1787857578)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17648     1253656   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9956     1261348   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28980     3577956   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14624     3592256   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170212   1%  /mnt/lustre