== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 18:31:36 (1787351496)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11528     1259776   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16272     1255032   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       27916     3579020   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15676     3590868   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7169888   1%  /mnt/lustre