3Ware 9550SXU16MLB10 User Guide - Page 132

Maintaining 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" on page 124. For more information about background tasks themselves, see "About Background Tasks" on page 119. 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 nonredundant 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. Viewing Current Task Schedules You can see the current schedules for background tasks on the Scheduling page. To view the current task schedule 1 Choose Management > Schedule from the menu bar. The Scheduling Page appears, showing the schedule for Rebuild Tasks. (Migration and initialization tasks follow the Rebuild Task schedule.) 2 To view Verify Tasks or Self-test Tasks, select it from the drop-down list at the top of the page. 126 3ware 9000 Series Serial ATA RAID Controller User Guide