== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 18:12:09 (1786831929)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17432     1253872   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9900     1261404   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32024     3574884   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11556     3595212   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43580     7170096   1%  /mnt/lustre