== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 02:45:11 (1787121911)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19368     1251936   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       12156     1259148   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22864     3584044   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20736     3586200   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170244   1%  /mnt/lustre