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Scheduling Background Tasks
You can set up scheduling windows for when background tasks can occur, so that routine maintenance of storage media occurs at times that will be least likely to interfere with peak I/O times. By creating and using schedules, you can limit active rebuilding, verifying, and testing of units to times that are least disruptive.
Note: Initialization and migration operations follow the rebuild schedule.
Although rebuild/migrate, verify, and self-test tasks are scheduled separately, you set up the schedules for each in a similar way. You can perform the following scheduling tasks:
Tip: If you want to change a scheduled task, you first remove the scheduled item and then add it back with the desired day, time, and duration.Sometimes you may want to manually start rebuild and verify tasks. For information about how to do so, see the procedures under Rebuilding Units and Verifying Units.
You can also set the rate at which background tasks are performed compared to I/O tasks. For more information, see Setting Background Task Rate.
For more information about background tasks themselves, see About Background Tasks.
Prioritization of Background Tasks
Rebuilding preempts verify operations. If a unit requires rebuilding, that process will take place before the unit is verified.
Migration receives higher priority than all other background tasks.
3ware 9000-series RAID 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.
Scheduled Task Duration
If a rebuild completes within a scheduled time, it will not start over come next schedule time block, unless someone degrades the unit and starts another rebuild on the unit in the meantime.
Rebuilds occur at the scheduled time when a drive degrades and there is a hot spare, or when a rebuild has been manually requested. If a rebuild does not complete in the scheduled time block, it will continue where it left off at the next schedule time block.
Similarly, if a verify operation does not complete in the scheduled time block, it will continue where it left off at the next scheduled time block.
Related Topics
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