== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 17:53:00 (1777585980)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17344     1253960   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9868     1261436   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25904     3581004   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17696     3589184   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170188   1%  /mnt/lustre