== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 18:12:30 (1789596750)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19300     1252004   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11732     1259572   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28904     3578088   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14700     3592264   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170352   1% /mnt/lustre