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Maintaining Units

158 3ware SAS/SATA RAID Software User Guide, Version 9.5.1

Background Tasks

Background tasks are maintenance tasks that help maintain the integrity of

your 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-tests

You can set up your system so that these tasks occur as they are needed, or

you can create schedules so that they occur during non-peak times.

Background tasks can have an effect on performance, so using a schedule can

minimize 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 Rebuild/Migrate Task Schedule

• Removing a Task Slot from a Schedule

• Adding a New Task Schedule Slot

• Selecting Self-tests to be Performed

Although the migration of a unit is handled as a background task, initiating it

is similar to creating a new unit. For details, see “Changing An Existing

Configuration by Migrating” on page 128.

About Initialization

For 3ware SATA RAID controllers, initialize means to put the redundant data

on the drives of redundant units into a known state so that data can be

recovered in the event of a disk drive failure. This is sometimes referred to as

background initialization or resynching, and does not erase user data.

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AMCC 3ware 9650SE-2LP Guía de usuario Pagina 170