== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 08:20:21 (1789129221)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17644     1253660   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10248     1261056   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25024     3581828   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18584     3587988   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7169816   1%  /mnt/lustre