== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 01:19:01 (1780463941)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17436     1253868   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9972     1261332   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20680     3586284   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22920     3584072   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170356   1%  /mnt/lustre