== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 18:13:11 (1788214391)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17456     1253848   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9616     1261688   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24788     3582148   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18812     3588068   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170216   1%  /mnt/lustre