== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 20:28:30 (1787876910)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11332     1259972   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16332     1254972   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24084     3582544   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19504     3587404   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43588     7169948   1%  /mnt/lustre