Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 157)

Background Tasks
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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 units from one configuration to another
• Self-tests
3ware RAID management software includes some controls to help you
balance completion of these tasks with host I/O responsiveness, so as to
minimize any conflict between the two. For example, you can schedule when
backgrounds tasks should be run (to avoid peak work hours) and you can
specify the rate at which they run in relationship to foreground I/O tasks. You
can also set the background task mode to address the issue of latency.
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
• Working with the Background Task Mode
• Setting the Background Task Mode
• 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 115.