== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 02:57:31 (1786345051)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       16884     1254420   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       20144     1251160   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26964     3580056   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18696     3588324   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45660     7168380   1%  /mnt/lustre