== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 10:28:39 (1789136919)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11360     1259944   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16152     1255152   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23688     3583136   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19876     3586668   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43564     7169804   1%  /mnt/lustre