== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 00:56:12 (1786769772)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17296     1254008   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9780     1261524   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20592     3585952   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22988     3584032   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43580     7169984   1%  /mnt/lustre