== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 04:29:46 (1788856186)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       15460     1255844   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9976     1261328   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28980     3578012   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14628     3592336   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170348   1% /mnt/lustre