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Appendix E: NameServer and NameServer Load Balancing Details Arbitrary sum weight factors You can specify arbitrary weight factors as any sum of values (not necessarily 100), but the weight of each is always proportional to the sum, as shown in Table 131. Table 131: Weight factors based on arbitrary sums Unified Broker name Weight factor AS1 2 2/7 AS2 2 2/7 AS3 3 3/7 Fail-over weight factor Percent of time selected You can also specify a fail-over weight factor of zero (0) for a Unified Broker instance that you want to accept connection requests when the NameServer finds no other Unified Broker instance available in the pool. 492 OpenEdge Getting Started: Installation and Configuration
Understanding server-level and connection-level fault tolerance Understanding server-level and connection-level fault tolerance By default, a Unified Broker instance relies on a single controlling NameServer to resolve client connection requests and a single Unified Broker instance to provide services to the client. You can configure the controlling NameServer so that multiple NameServer instances are available to resolve any client connection request, thus providing connection-level fault tolerance. If your product supports load balancing, you can also configure a single NameServer to resolve each connection request using multiple Unified Broker instances that support the same Application Service, thus providing server-level fault tolerance. Figure 9 shows the relationship between these configuration options. Client Server -level fault tolerance Unified Broker instances NameServer instance Client Figure 9: Server-level and connection-level fault tolerance These two levels of fault tolerance operate as follows: Connection -level fault tolerance NameServer instances Unified Broker instance • Server-level fault tolerance — Allows multiple Unified Broker instances to register with a NameServer for the same Application Service. A client requesting a connection is connected to one of several registered Unified Broker instances that the NameServer determines are available to provide the specified Application Service. If appropriate weight factors are specified, the NameServer also balances connection load among the several broker instances. For more information on load balancing, see the “Understanding load balancing” section on page 491. • Connection-level fault tolerance — Allows you to configure a collection of NameServers that work together to resolve a client connection request. You can use two different techniques, individually or together, to implement a fault-tolerant NameServer collection. This section describes these techniques and assumes that you are familiar with the documentation on using the NameServer with your Unified Broker product. You can apply server-level and connection-level fault tolerance individually or together to achieve the level of fault tolerance that your application requires. OpenEdge Getting Started: Installation and Configuration 493
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® ® PROGRESS® OPENEDGE® OpenEdg
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Contents Preface . . . . . . . . .
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Contents AdminServer considerations
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Configuration 10 Once you have inst
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Introducing OpenEdge Management and
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Working with Unified Brokers Workin
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Understanding and using the AdminSe
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Ubroker.properties file and product
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-N network-type Specifies the netwo
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Appendix A: Preinstallation Checkli
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