Dell PowerEdge RAID Controller 6i - Manual (Page 39)

About PERC 6 and CERC 6i Controllers
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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