== sanity test 56dc: test 'lfs df -o' only shows OST devices ========================================================== 06:20:33 (1768562433)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       14268     1257036   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19568     1251736   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       26956     3579980   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       16636     3589880   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43592     7169860   1%  /mnt/lustre