AMCC 3ware 9000 Series, User Manual

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3DM 2 Reference
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You can also enable or disable use of the schedule for the selected background
tasks by selecting either
Follow Schedule or Ignore Schedule . When these
schedules are set to be ignored, these tasks can be performed at any time, and
are not restricted to the scheduled times.
Note: Scheduling of these tasks is only available on the 9000-
series controllers.
For details about the different background tasks, see “About Background
Tasks” on page 119.
About Task Schedules
Each type of task may be scheduled for up to 7 times per week. This limits
active initializing, rebuilding, verifying, migrating, and testing of a unit to the
times you specify, so that the task does not interfere with peak I/O times.
If all 7 schedule slots are filled, you must first remove one or more schedule
times before you can add another.
You may set schedule times whether scheduling is set to be followed or
ignored. This is useful if you want to temporarily disable the schedule.
If you remove all the schedule times for a particular background task,
initializations, rebuilds, and migrations will run anytime, as they are needed.
Verify will only run if started by the CLI or if the Verify Unit button is
clicked.
For information about adding and removing schedules, and setting schedules
to be followed or ignored, see “Scheduling Background Tasks” on page 125
About Self-tests
Unlike scheduling of rebuilds and verifies, scheduling of self-tests is always
followed. To disable self-tests you either remove all schedule times, or
uncheck the tests listed in the Tasks column.
Note: Only the checked tasks will be run during the scheduled
times. If none of the tasks are checked, self-tests will never run,
even if you have scheduled time slots set.
Two self-tests can be scheduled:
Upgrade UDMA mode. This test checks the speed at which data transfer to
drives is occurring, to see if the UDMA mode can be increased. (If you are
already running at the fastest UDMA mode, then this self-test has no effect.)
The UDMA mode can become downgraded in the event that cable CRC errors
are encountered, requiring multiple retries to read sectors. In severe cases, the