LSI 3ware SAS 9750-8i Guide de l'utilisateur télécharger pdf (Page 181)

Scheduling Background Tasks

www.lsi.com/channel/products 169

Figure 75. Background Task Rate on Controller Settings page

The furthest left buttons set the firmware to the fastest rebuild and verify

settings. This means that maximum processing time will be given to

rebuilds or verifies rather than I/O. The furthest right buttons set the

firmware to the slowest rebuild and verify settings, giving maximum

processing time to I/O.

After you select one of the radio buttons, the page refreshes, and a

message at the top confirms the change you have made.

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.

Scheduling Background Tasks

You can set up scheduling windows for when background tasks occur so that

routine maintenance of storage media occurs when it will be least likely to

interfere with day-to-day work on the system (peak I/O times). By creating

and using schedules, you can specify when active rebuilding, migrating,

verifying, and testing of units should occur. For example, you might wish

these tasks to occur at 2 AM each day, or on weekends.

Note: Initialization follows the rebuild/migrate schedule. The default setting for both

is to ignore the schedule.

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LSI 3ware SAS 9750-8i Guide de l'utilisateur Page 181