== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 16:24:12 (1787862252)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11548     1259756   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16532     1254772   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28048     3578496   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15560     3591320   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7169816   1%  /mnt/lustre