== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 05:46:13 (1785231973)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17508     1253796   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9820     1261484   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32252     3574628   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11336     3595404   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43588     7170032   1%  /mnt/lustre