== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 04:52:06 (1788943926)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17424     1253880   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9588     1261716   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28204     3578732   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15404     3591476   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170208   1%  /mnt/lustre