== sanity test 56dc: test 'lfs df -o' only shows OST devices ========================================================== 00:03:27 (1763355807)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       15584     1255720   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21708     1249596   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       31648     3575372   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       12932     3594088   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44580     7169460   1%  /mnt/lustre