| PRIMECLUSTER Installation and Administration Guide 4.2 (Linux for Itanium) |
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| Part 2 Installation | > Chapter 5 Building a Cluster | > 5.1 Initial Cluster Setup | > 5.1.2 Setting Up the Shutdown Facility |
Even if a cluster partition
occurs due to a failure in the cluster interconnect, all the nodes will still be able to access the user resources. For details on the cluster partition, see "2.2.2.1 Protecting data integrity" in the "PRIMECLUSTER Concept Guide."
To guarantee the consistency of the data constituting user resources, you have to determine the node groups to survive and those that are to be forcibly stopped.
The weight assigned to each node group is referred to as a "Survival priority" under PRIMECLUSTER.
The greater the weight of the node, the higher the survival priority. Conversely, the less the weight of the node, the lower the survival priority. If multiple node groups have the same survival priority, the node group that includes a node with the name that is first in alphabetical order will survive.
Survival priority can be found in the following calculation:
Survival priority = SF node weight + ShutdownPriority of userApplication
- SF node weight (Weight):
- Weight of node. Default value = 1. Set this value while configuring the shutdown facility.
- userApplication ShutdownPriority:
- Set this attribute when userApplication is created. For details on how to change the settings, see "Changing the Operation Attributes of a userApplication."
For details on the ShutdownPriority attribute of userApplication, see "9.1 Attributes available to the user" in the "PRIMECLUSTER Reliant Monitor Service (RMS) with Wizard Tools Configuration and Administration Guide."
The typical scenarios that are implemented are shown below:[Largest node group survival]
Set the weight of all nodes to 1 (default).
Set the attribute of ShutdownPriority of all user applications to 0 (default).
[Specific node survival]
Set the "weight" of the node to survive to a value more than double the total weight of the other nodes.
Set the ShutdownPriority attribute of all user applications to 0 (default).
In the following example, node1 is to survive:
[Specific application survival]
Set the "weight" of all nodes to 1 (default).
Set the ShutdownPriority attribute of the user application whose operation is to continue to a value more than double the total of the ShutdownPriority attributes of the other user applications and the weights of all nodes.
In the following example, the node for which app1 is operating is to survive:
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