== sanity test 56dc: test 'lfs df -o' only shows OST devices ========================================================== 02:16:12 (1776924972)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23560     1247744   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20564     1250740   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       32012     3575008   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       13608     3593412   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45620     7168420   1%  /mnt/lustre