Patrol Read Modes - Dell 6 series User Manual

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 involved in any of the following
operations:
• Rebuild
• Replace Member
• Full or Background Initialization
• 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. In this
mode, Patrol Read is enabled to run automatically and start every seven
days on SAS and SATA HDDs. Patrol Read is not necessary on SSD and is
disabled by default. You can start and stop Patrol Read as well.
• Manual — Patrol Read does not run automatically and you must start it
manually.
• Disabled — Patrol Read is not allowed to start on the controller.
About PERC 6 and CERC 6/i Controllers
39