== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 01:31:12 (1787895072)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17760     1253544   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10224     1261080   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       27060     3579904   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16544     3590364   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170268   1% /mnt/lustre