== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 03:47:57 (1788767277)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11236     1260068   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16296     1255008   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21916     3585020   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21692     3585188   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170208   1% /mnt/lustre