== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 00:38:48 (1790397528)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       21556     1249748   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16096     1255208   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30888     3576132   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14732     3592288   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45620     7168420   1% /mnt/lustre