== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 02:10:05 (1783145405)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       21092     1250212   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15444     1255860   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22692     3584328   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22168     3584852   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44860     7169180   1%  /mnt/lustre