Moab Workload Manager®

5.6 Scheduling Jobs When VMs Exist

Each Job has a VM usage policy. This policy directs how Moab considers physical and virtual nodes when allocating resources for a job. Three policies are currently supported:

REQUIREPM

States that the job should run only on physical machines.

REQUIREVM

States that the job should run only on virtual machines that already exist.

CREATEVM

The job should create a one-time use virtual machine for the job to run on. Any virtual machines created by the job are destroyed when the job is finished. If specified, the job itself must request an OS so an appropriate virtual machine can be provisioned.

If the HIDEVIRTUALNODES parameter is configured with a value of TRANSPARENT, jobs are given a default policy of REQUIREVM. Otherwise they are given a policy of REQUIREPM. These defaults can be overridden by using the extension resource VMUSAGEPOLICY or by setting the policy via a job template. An example of both is given below.

As an extension resource:

> msub -l vmusagepolicy=requirepm

As a template parameter:

JOBCFG[vmjob] VMUSAGE=requirevm

The VMUSAGEPOLICY of a job can be viewed by using checkjob -v.