== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 14:16:16 (1780337776)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11440     1259864   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16132     1255172   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32236     3574504   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11336     3595516   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43572     7170020   1%  /mnt/lustre