== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 07:24:16 (1788607456)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19508     1251796   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11856     1259448   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20524     3586328   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23056     3583656   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43580     7169984   1% /mnt/lustre