Chapter 9. Maintaining Units142 3ware Serial ATA RAID Controller User GuideBackground TasksBackground tasks are maintenance tasks that help maintain the integrity ofyour drives and data. These tasks include• Initialization of units• Verification of units• Rebuilds when units have become degraded• Migration of an on-line RAID from one RAID configuration to another• Self-testsYou can set up your system so that these tasks occur as they are needed, oryou can create schedules so that they occur during non-peak times.Background tasks can have an effect on performance, so using a schedule canminimize the impact.This section includes the following topics related to background tasks:• About Initialization• About Verification• Starting a Verify Manually• Rebuilding Units• Cancelling a Rebuild and Restarting It with a Different Drive• Setting Background Task Rate• Background Task Prioritization• Scheduling Background Tasks• Viewing Current Task Schedules• Turning On or Off Use of a Task Schedule• Removing a Task Schedule• Adding a New Task Schedule Slot• Selecting Self-tests to be PerformedAlthough the migration of a unit is handled as a background task, initiating itis similar to creating a new unit. For details, see “Changing An ExistingConfiguration by Migrating” on page 115.
