== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 00:49:46 (1786423786)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210176        8576     2199552   1%  /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       23552     3730432   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       25600     3743744   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7542784       49152     7474176   1%  /mnt/lustre