== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 04:06:23 (1786953983)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17260     1254044   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9772     1261532   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30236     3576756   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13368     3593624   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170380   1%  /mnt/lustre