== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 06:47:23 (1787395643)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19480     1251824   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       12084     1259220   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22836     3583708   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20768     3586056   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7169764   1%  /mnt/lustre