== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 01:14:58 (1790745298)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17656     1253648   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10252     1261052   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28188     3578692   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15420     3591124   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7169816   1% /mnt/lustre