Submit a job with varying levels of host preferences.
You can indicate different levels of preference by specifying a number after the plus sign (+). The larger the number, the higher the preference for that host or host group. You can also specify the + with the keyword others.
bsub -m "groupA+2 groupB+1 groupC" myjob
In this example, LSF gives first preference to hosts in groupA, second preference to hosts in groupB and last preference to those in groupC. Ordering within a group is still determined by load.