== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 18:18:20 (1787869100)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       13456     1257848   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18376     1252928   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       27064     3579816   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16544     3590336   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170152   1%  /mnt/lustre