Users Guide

Path Failure message to indicate that the enclosure has lost a communication path to the controller, indicating that the enclosure is
no longer in redundant path mode.
Related links
Path Health
Clearing The Connectors Redundant Path View
Clearing The Redundant Path View
Consider a case where you reboot your system and Storage Management, displays the logical connector with a path failure message.
It is possible that you may have intentionally unplugged the second connector. In this case, the path failure message is not relevant.
There could be a fault in the connected cable or the cable may not be connected properly to the controller. In both cases, Storage
Management displays that the system was in redundant path conguration before reboot and is no longer in this conguration. If you
are sure you, do not want the redundant path mode, clear the existing redundant path view using Clear Redundant Path View
provided in the Changing The Controller Properties controller task. Selecting this option clears the redundant path view and the
connectors are represented on the user interface as Connector 0 and Connector 1.
Related links
Setting The Redundant Path Conguration
Logical Connector Properties And Tasks
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 identies 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 identied 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
– Reconguration 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.
Related links
Starting And Stopping Patrol Read
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 specied 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 specied 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.
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