== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 22:45:45 (1786761945)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19500     1251804   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       12168     1259136   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21988     3584976   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21616     3585404   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170380   1%  /mnt/lustre