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About PERC 6 and CERC 6i Controllers 39
3
Patrol Read
adjusts the amount of controller resources dedicated to
Patrol
Read
operations based on outstanding disk I/O. For example, if the system
is busy processing I/O operation, then
Patrol Read
uses fewer resources to
allow the I/O to take a higher priority.
4
Patrol Read
does not run on any disks that are involved in any of the
following operations:
• Rebuild
• Replace Member
• Full or Background Initializations
• Consistency Check
• RAID Level Migration or Online Capacity Expansion
Patrol Read Modes
The following describes each of the modes Patrol Read can be set to:
•
Auto
(default)-
Patrol Read
is set to the Auto mode by default. This
means that it is enabled to run automatically and start every seven days.
You can start and stop
Patrol Read
as well.
•
Manual
-
Patrol Read
does not run automatically. You must start the
Patrol Read
manually when the
Manual
mode is set.
•
Disabled
-
Patrol Read
is not allowed to start on the controller.
Dell_PERC6.1_UG.book Page 39 Wednesday, April 15, 2009 4:18 PM