== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 15:30:09 (1782243009)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17420     1253884   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9800     1261504   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29872     3577148   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13732     3593288   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1%  /mnt/lustre