3.5. Configuring a Fence Device

CentOS 6 Essentials
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To ensure data integrity, only one member can run a cluster service and access cluster service data at one time. The use of fence devices in the cluster hardware configuration enables a node to power-cycle another node before restarting that member's cluster services during the failover process. This prevents more than one node from simultaneously accessing the same data and corrupting it. You must use a fence device to guarantee data integrity under all failure conditions.

1. Select the member for which you want to configure a power controller connection and click Manage Fencing For This Node. The Fence Configuration dialog box is displayed as shown in Figure 3-8.

   

   Figure 3-8. Configuring Fence Devices Per Node

2. Specify the following information depending on whether the device is connected to one of several supported fence devices.

   Field	Description
   Name	A name for the APC device connected to the cluster.
   IP Address	The IP address assigned to the device.
   Login	The login name used to access the device.
   Password	The password used to authenticate the connection to the device.

   Table 3-4. Configuring an APC Fence Device

   Field	Description
   Name	A name for the IBM Bladecenter device connected to the cluster.
   IP Address	The IP address assigned to the device.
   Login	The login name used to access the device.
   Password	The password used to authenticate the connection to the device.

   Table 3-5. Configuring an IBM Blade Center that Supports Telnet

   Field	Description
   Name	A name for the Brocade device connected to the cluster.
   IP Address	The IP address assigned to the device.
   Login	The login name used to access the device.
   Password	The password used to authenticate the connection to the device.

   Table 3-6. Configuring a Brocade Fibre Channel Switch

   Field	Description
   IP Address	The IP address assigned to the PAP consle.
   Login	The login name used to access the PAP console.
   Password	The password used to authenticate the connection to the PAP console.

   Table 3-7. Configuring a Bull Platform Administration Processor (PAP) Interface

   Field	Description
   IP Address	The IP address assigned to the IPMI port.
   Login	The login name of a user capable of issuing power on/off commands to the given IPMI port.
   Password	The password used to authenticate the connection to the IPMI port.

   Table 3-8. Configuring a Bull Intelligent Platform Management Interface (IPMI)

   Field	Description
   Name	A name for the BladeFrame device connected to the cluster.
   CServer	The hostname (and optionally the username in the form of username@hostname) assigned to the device. Refer to the fence_egenera(8) manpage for more information.

   Table 3-9. Configuring an Egenera BladeFrame

   Field	Description
   Name	A name for the GNBD device used to fence the cluster. Note that the GFS server must be accessed via GNBD for cluster node fencing support.
   CServer	The hostname (and optionally the username in the form of username@hostname) assigned to the device. Refer to the fence_egenera(8) manpage for more information.

   Table 3-10. Configuring a Global Network Block Device (GNBD) fencing agent

   Field	Description
   Name	A name for the server with HP iLO support.
   Login	The login name used to access the device.
   Password	The password used to authenticate the connection to the device.
   Hostname	The hostname assigned to the device.

   Table 3-11. Configuring an HP Integrated Lights Out (iLO) card

   Field	Description
   Name	A name to assign the Manual fencing agent. Refer to fence_manual(8) for more information.

   Table 3-12. Configuring Manual fencing

   Field	Description
   Name	A name for the McData device connected to the cluster.
   IP Address	The IP address assigned to the device.
   Login	The login name used to access the device.
   Password	The password used to authenticate the connection to the device.

   Table 3-13. Configuring a McData Fibre Channel Switch

   Field	Description
   Name	A name for the SanBox2 device connected to the cluster.
   IP Address	The IP address assigned to the device.
   Login	The login name used to access the device.
   Password	The password used to authenticate the connection to the device.

   Table 3-14. Configuring a QLogic SanBox2 Switch

   Field	Description
   Name	A name for the Vixel switch connected to the cluster.
   IP Address	The IP address assigned to the device.
   Password	The password used to authenticate the connection to the device.

   Table 3-15. Configuring a Vixel SAN Fibre Channel Switch

   Field	Description
   Name	A name for the WTI power switch connected to the cluster.
   IP Address	The IP address assigned to the device.
   Password	The password used to authenticate the connection to the device.

   Table 3-16. Configuring a WTI Network Power Switch

3. Click OK.

4. Choose File => Save to save the changes to the cluster configuration.