AMCC 3WARE 720-0138-00 - Manual (Page 106)

Chapter 8. 3DM 2 Reference
98 3ware Serial ATA RAID Controller User Guide for the Power Mac G5
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.
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.
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.