== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 22:37:07 (1788403027)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19468     1251836   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11884     1259420   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29860     3577132   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13748     3593216   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170348   1% /mnt/lustre