== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 06:19:12 (1787134752)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17168     1254136   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9704     1261600   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23952     3583012   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19648     3587316   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170328   1%  /mnt/lustre