== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 08:49:43 (1781009383)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17372     1253932   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10012     1261292   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24980     3581900   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18624     3588172   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170072   1%  /mnt/lustre