Job performance impact

The Job Engine service monitors system performance to ensure that maintenance jobs do not significantly interfere with regular cluster I/O activity and other system administration tasks. Job Engine uses impact policies that you can manage to control when a job can run and the system resources that it consumes.

Job Engine has four default impact policies that you can use but not modify. The default impact policies are:

Impact policy

Allowed to run

Resource consumption

LOW

Any time of day.

Low

MEDIUM

Any time of day.

Medium

HIGH

Any time of day.

High

OFF_HOURS

Outside of business hours. Business hours are defined as 9AM to 5pm, Monday through Friday. OFF_HOURS is paused during business hours.

Low

If you want to specify other than a default impact policy for a job, you can create a custom policy with new settings.

Jobs with a low impact policy have the least impact on available CPU and disk I/O resources. Jobs with a high impact policy have a significantly higher impact. In all cases, however, the Job Engine uses CPU and disk throttling algorithms to ensure that tasks that you initiate manually, and other I/O tasks not related to the Job Engine, receive a higher priority.