== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 03:10:37 (1789715437)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       18976     1252328   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       22116     1249188   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29984     3577036   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15660     3591360   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45644     7168396   1% /mnt/lustre