User's Manual
However, if the communication channel between any two enclosures is lost, the redundant path configuration is degraded and the health of the logical
connector is displayed as degraded. For a brief outline of this scenario, see Table6-7.
Table 6-7. Component Health
In this case, the enclosure status is displayed in warning mode. The Enclosures page displays all enclosure components (EMMs, Fans, Physical Disks, Power
Supplies, and Temperature) to be in normal condition. Select the Information/Configuration subtab of the enclosure. This page displays the Path Failure
message to indicate that the enclosure has lost a communication path to the controller, thereby indicating that the enclosure is no longer in redundant path
mode. For more information, see Path Health.
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. Else, 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
configuration before reboot and is no longer in this configuration. 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 Change 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 Topics
l Logical Connector Properties and Tasks
l Enclosure and Backplane Properties and Tasks
Set Patrol Read Mode
Does my controller support this feature? See Supported Features.
Patrol Read is a feature for identifying disk errors in order to avoid disk failures and data loss or corruption. The Patrol Read only runs on disks that are being
used in a virtual disk or that are hot spares.
When possible, the Patrol Read corrects disk errors and restores the integrity of the data. The Patrol Read task runs in the background. When the Patrol Read
mode is set to Auto, the Patrol Read is initiated when the controller has been idle for a period of time and when no other background tasks are active. In this
circumstance, the Patrol Read feature also enhances system performance as disk errors can be identified and corrected while the disk is not the subject of I/O
activity.
The controller adjusts the amount of system resources dedicated to the Patrol Read based on the amount of controller activity that is competing with the
Patrol Read task. During heavy controller activity, fewer system resources are dedicated to the Patrol Read task.
The Patrol Read does not run on a physical disk in the following circumstances:
l The physical disk is not included in a virtual disk or assigned as a hot spare.
l The physical disk is included in a virtual disk that is currently undergoing one of the following:
¡ A rebuild
¡ A reconfiguration or reconstruction
¡ A background initialization
¡ A check consistency
In addition, the Patrol Read suspends during heavy I/O activity and resumes when the I/O is finished.
Disconnected
Available
Health of Logical Connector
Path between Enclosure n and Enclosure n+1
Connector 0 (C0)
Connector 1 (C1)
Available
Available
Available
Disconnected
Disconnected
Available