== sanity test 56dc: test 'lfs df -o' only shows OST devices ========================================================== 20:26:50 (1773620810)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       22160     1249144   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       18064     1253240   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       24384     3582636   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       20244     3586776   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44628     7169412   1%  /mnt/lustre