3DM 2 Online Help

Background Task Prioritization
Although migration tasks follow the same schedule as rebuild and initialization tasks, they are always given the highest priority because of the controller and disk resources required during migration.
Once a unit is put into the migration state, it must be allowed to complete the process. While migrating, rebuilds or verifies to the unit are not permitted.
Rebuilding preempts verify operations. If a unit requires rebuilding, that process will take place before the unit is verified.
Controllers can work on multiple units at the same time. This means that if you have both a redundant unit and a non-redundant unit, the verification of the redundant unit and the media scan of the non-redundant unit will occur at the same time.

Related Topics
  Background Tasks
  Scheduling Background Tasks
  Setting Background Task Rate
  Viewing Current Task Schedules
  Turning On or Off Use of a Task Schedule
  Removing a Task Schedule
  Adding a New Task Schedule Slot
  Rebuilding Units
  Starting a Verify Manually

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