Users Guide
To Locate Set Reconstruct Rate In Storage Management
1 In the Server Administrator window, under the system tree, expand Storage to display the controller objects.
2 Select a controller object.
3 Click Information/Conguration on the controller Properties page.
4 Select Set Reconstruct Rate from the Available Tasks drop-down menu.
5 Select Execute.
You can also locate this task from the Change Controller Properties drop-down menu.
Setting The Patrol Read Mode
NOTE: This task is not supported on PERC hardware controllers running in HBA mode.
Does my controller support this feature? See Supported Features.
Patrol read identies disk errors in order to avoid disk failures and data loss or corruption. The Set Patrol Read task is applicable only for
disks used as virtual disks or hot spares.
The Set Patrol Read task runs in the background and corrects, when possible. When the Set Patrol Read mode is set to Auto, patrol read
is initiated when the controller is idle for a period of time and when no other background tasks are active. In this scenario, the patrol read
enhances the system performance as disk errors can be identied and corrected when there is not input/output activity on the disk.
The controller adjusts the amount of system resources dedicated for patrol read based on the amount of controller activity that is
competing with the Patrol Read task. When the controller activity is high, fewer system resources are dedicated to the patrol read task.
Patrol Read does not run on a physical disk in the following circumstances:
• The physical disk is not included in a virtual disk or is assigned as a hot spare.
• The physical disk is included in a virtual disk that is currently undergoing one of the following:
– Rebuild
– Reconguration or reconstruction
– Background initialization
– Check consistency
In addition, the Patrol Read suspends during heavy I/O activity and resumes when the I/O is nished.
To Set The Patrol Read Mode
Select the desired Patrol Read Mode option. The options available are:
• Auto — Initiates the Patrol Read task. After the task is complete, it automatically runs again within a specied period. For example, on
some controllers the Patrol Read runs every four hours and on other controllers, the Patrol Read runs every seven days. The Patrol
Read task runs continuously on the system starting again within the specied period after each iteration of the task completes. If the
system reboots while the Patrol Read task is running in Auto mode, the Patrol Read restarts at zero percent (0%). When the Patrol
Read task is set to Auto mode, you cannot start or stop the task. Auto mode is the default setting.
NOTE
: For more information on how often the Patrol Read task runs when in Auto mode, see your controller documentation.
• Manual — Enables you to start and stop the Patrol Read task using Start and Stop Patrol Read. Setting the mode to Manual does not
initiate the Patrol Read task. If the system reboots while Patrol Read is running in Manual mode, Patrol Read does not restart.
• Disabled — Prevents the Patrol Read task from running on the system.
Controllers
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