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Connectors
A controller contains one or more connectors (channels or ports) to which you can attach disks. You can externally access a connector by attaching an enclosure (for external disks) to the system or internally access by attaching to the backplane (for internal disks) of a system.
You can view the connectors on the controller by expanding the controller object in the tree view.
NOTE: For PCIe SSD, connectors are referred as PCIe SSD extenders.
Topics:
•
•
Creating A Channel-Redundant Virtual Disk
•
•
Connector Properties And Tasks
•
Logical Connector Properties And Tasks
Channel Redundancy
You can create a virtual disk that uses physical disks that are attached to different controller channels. The physical disks may reside in an external enclosure or the backplane (internal enclosure). If the virtual disks maintain redundant data on different channels, then these virtual disks are channel redundant. Channel redundancy is when one of the channels fail, the data is not lost as redundant data resides on another channel.
Channel redundancy is implemented by selecting physical disks on different channels when using the Create Virtual Disk Advanced
Wizard .
NOTE: Channel redundancy only applies to controllers that have more than one channel and that attach to an external disk enclosure.
Creating A Channel-Redundant Virtual Disk
NOTE: Channel redundancy only applies to controllers that have more than one channel and that attach to an external disk enclosure.
The following instructions provide information on creating a virtual disk that uses channel redundancy.
1. Launch the Create Virtual Disk Advanced Wizard : a) In the Server Administrator window, under the system tree, click Storage dashboard.
b) Locate the controller on which you are creating a channel-redundant virtual disk and expand the controller object until the Virtual
Disks object is displayed.
c) Select Virtual Disks and click Go To The Create Virtual Disk Wizard .
d) Click Virtual Disk Advanced Wizard .
2. Follow the steps in
Create Virtual Disk Advanced Wizard
.
3. Click Exit Wizard to cancel the virtual disk creation. In this step, you select the channels and the disks to be used by the virtual disk.
The selections you make determine whether the virtual disk is channel-redundant.
There are specific RAID level and configuration requirements for implementing channel redundancy. You must select the same number of physical disks on each channel that you use. For information on the number of physical disks that can be used for different RAID
levels, see Number Of Physical Disks Per Virtual Disk
. For information on controller-specific implementations of the RAID levels, see
Controller - Supported RAID Levels .
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Creating A Physical Disk For Channel Redundant Virtual
Disks On PERC Controllers
The following sections describe creating a channel-redundant virtual disk using RAID 10 or RAID 50 on PERC controllers.
Creating A Channel-Redundant Virtual Disk Using RAID 10
To create a channel-redundant virtual disk using RAID 10:
1. Select one physical disk on each of the two channels.
2. Select an additional disk on each of the two channels. You have now selected the minimum number of disks for a RAID 10.
Repeat step 2 until you have selected the desired number of disks.
3. Click Continue to exit.
Creating A Channel-Redundant Virtual Disk Using RAID 50
To create a channel-redundant virtual disk using RAID 50:
1. Select one physical disk on each of the three channels.
2. Select an additional disk on each of the three channels. You have now selected the minimum number of disks for a RAID 50.
Repeat step 2 until you have selected the desired number of disks.
3. Click Continue to exit.
Connector Health
The connector health page displays the status of the connector and the components attached to the connector.
Controller Information
For information on the controller, see
Connector Components
For information on attached components, see Enclosures And Backplanes
.
Connector Properties And Tasks
To view information about the connector and execute connector tasks, use the connector properties and tasks page.
Table 23. Connector Properties
Property Definition
These icons represent the severity or health of the storage component.
Name
— Normal/OK
— Warning/Non-critical
— Critical/Failure/Error
For more information, see
Storage Component Severity . A Warning or
Critical severity may indicate that the connector is unable to communicate with attached devices such as an enclosure. Check the status of attached
devices. For more information, see Cables Attached Correctly and
Displays the connector number.
Connectors 95
Property
State
Connector Type
Termination
SCSI Rate
Definition
Displays the status of the connector. Possible values are:
• Ready — The connector is functioning normally.
• Degraded — The connector has encountered a failure and is operating in a degraded state.
• Failed — The connector has encountered a failure and is no longer functioning.
Displays whether the connector is operating in RAID or SCSI mode.
Depending on the controller type, the connector can be either a SCSI connector or a SAS port.
Indicates the termination type of the connector. Possible values are:
• Narrow — Indicates an 8–bit data bus.
• Wide — Indicates a 16–bit data bus.
• Unknown — Indicates that the termination type is unknown.
• Not Terminated — On a SCSI controller, this property indicates that the data bus is not terminated. This property is also displayed when the termination type is Unknown .
Displays the SCSI speed for a SCSI device.
Related concepts
Rescanning A Controller Connector
Rescanning The Connector
Does my controller support this feature? See
On a SCSI controller, the Rescan task rescans the controller connectors to verify the currently connected devices or to recognize new devices that have been added to the connectors. Performing a rescan on a connector is similar to performing a rescan on the controller.
For information on scheduling a rescan, see
Rescanning To Update Storage Configuration Changes .
NOTE: Rescan is not supported on non-RAID SCSI controllers. Reboot the system before Storage Management can see configuration changes on non-RAID SCSI controllers. Otherwise, configuration changes are not reflected in the Storage
Management graphical user interface (GUI).
Rescanning A Controller Connector
To rescan a controller connector:
1. In the Server Administrator window, under the system tree, expand the Storage dashboard to display the controller objects.
2. Expand a controller object.
3. Select a connector object.
4. Click Information/Configuration on the connector Properties page.
5. Select Rescan from the Connector Tasks drop-down menu.
6. Click Execute.
Logical Connector Properties And Tasks
To display the information about the logical connector (connector in redundant path mode) and to execute connector tasks, use the logical connector properties and tasks page.
96 Connectors
Table 24. Logical Connector Properties
Property
Name
State
Connector Type
Definition
These icons represent the severity or health of the storage component.
— Normal/OK
— Warning/Non-critical
— Critical/Failure/Error
For more information, see
A Warning or Critical severity may indicate that the connector is unable to communicate with attached devices such as an enclosure. Check the status of attached devices. For more information, see
and
Displays the connector number. The default value is 0 .
Displays the status of the connector. Possible values are:
• Ready — The connector is functioning normally.
• Degraded — The connector has encountered a failure and is operating in a degraded state.
• Failed — The connector has encountered a failure and is no longer functioning.
Displays whether the connector is operating in RAID mode. The connector is always a SAS connector.
Related concepts
Path Health
The path health of the connectors is represented as normal, warning, or critical. The possible values are displayed as Available ,
Degraded , or Failed .
If the enclosure health is displayed as degraded and further investigation shows all enclosure components (EMMs, Fans, Physical Disks,
Power Supplies, and Temperature) to be in normal condition, select the Information/Configuration subtab of the enclosure to view details of the Path Failure .
Related concepts
Setting The Redundant Path Configuration
Logical Connector Properties And Tasks
Clearing The Connectors Redundant Path View
If you do not want the redundant path view, physically disconnect the connector port from the enclosure and reboot the system. After the system reboots, the user interface still displays the logical connector, but in a critical state. To clear the redundant path mode, select
Clear Redundant Path view from the Controller Tasks .
Selecting this option clears the redundant path view and the connectors are represented on the user interface as Connector 0 and
Connector 1.
Related concepts
Setting The Redundant Path Configuration
Connectors 97
Connector Components
For information on attached components, see Enclosure And Backplane Properties And Tasks
.
98 Connectors
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