AMCC 720-0138-00 manual Task Schedules, Self-test Schedules

Chapter 8. 3DM 2 Reference

Follow Schedule/Ignore Schedule. You can enable or disable the schedule for the Rebuild/Migrate and Verify tasks by selecting either Follow Schedule or Ignore Schedule. When schedules are set to be ignored, these tasks can be performed at any time, and are not restricted to the scheduled times.

For details about the different background tasks, see “Background Tasks” on page 68.

Task Schedules

Initially, 7 schedule slots are defined, for 24 hours each. Even if Follow Schedule is enabled, this schedule is equivalent to Ignore Schedule, because tasks can run at any time, round the clock.

A maximum of 7 slots can be created, so to set a different schedule, start by deleting one or more of the existing scheduled slots, and then add new slots.

For step-by-step instructions for adding and removing schedules, and setting schedules to be followed or ignored, see “Scheduling Background Tasks” on page 76.

Self-test Schedules

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 UDMA mode may be downgraded from ATA 150 to ATA 133, to ATA 100, to 66, to 33.

This check is also done every time the system is booted.

98 3ware Serial ATA RAID Controller User Guide for the Power Mac G5