AMCC 720-0138-00 ユーザーズマニュアル

Chapter 8. 3DM 2 Reference

98

                                      

 You can enable or disable the schedule 

for the Rebuild/Migrate and Verify tasks by selecting either 

or 

. 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.

Initially, 7 schedule slots are defined, for 24 hours each. Even if 

 is enabled, this schedule is equivalent to 

, 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.

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: 

 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.

 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.