== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 00:09:33 (1786075773)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17668     1253636   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10072     1261232   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20924     3585788   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22660     3584192   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7169980   1%  /mnt/lustre