== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 21:48:06 (1786412886)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11696     1259608   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16580     1254724   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30120     3576788   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13484     3593480   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170268   1%  /mnt/lustre