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NOTE Many organizations decide to rely on hardware load balancers for this task They provide
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exactly the same service as NLB, but they often also include WAN traffic acceleration capabilities Vendors such as CAI Networks (wwwcainetworkscom) and F5 Networks (wwwf5com) offer products in this category These devices work well with VSOs
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FIGURE 11-6 The NLB Manager interface
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Windows Server Failover Clustering
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WS08 failover clusters offer the same type of availability services as NLB clusters, but rely on a different model Whereas in NLB clusters, server configurations do not have to be identical, it is the purpose of the server cluster to make identical servers redundant by allowing immediate failover of hosted applications or services As illustrated in Figure 11-5, Windows Server 2008 supports up to sixteen node clusters WSFCs can include several configurations You can design the cluster so that each node will perform different tasks, but will be ready to failover any of the other nodes services and applications Or you can design the cluster so that applications operate at the same time on each of the nodes For example, you could design a four-node financial database cluster so that the first node managed order entry, the second order processing, the third payment services, and the fourth the other accounting activities To do so, your application must be fully cluster-aware completely compliant with all of the WSFC features Not all applications or even WS08 services are fully cluster-aware
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Cluster Compatibility List
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Even in Microsoft s own product offering, there are some particularities in terms of clustering compatibility Cluster compatibility can fall into one of four categories: WSFC-aware is a product or internal WS08 service that can take full advantage of the cluster service It can communicate with the cluster application programming interface (API) to receive status and notification from the server cluster It can react to cluster events WSFC-independent (or unaware) is a product or internal WS08 service that is not aware of the presence of the cluster but that can be installed on a cluster and will behave the same way as if it was on a single server It responds only to the most basic cluster events WFSC-incompatible is a product or internal WS08 service that does not behave well in the context of a cluster and should not be installed on a server cluster NLB-compatible lists products that are well suited to NLB clusters NLB and WSFC are often incompatible with each other Table 11-3 categorizes Microsoft s Windows Server System and WS08 functions in terms of cluster compatibility The information in Table 11-3 is subject to change as each of the products evolves, but it serves as a good starting point in determining how you can configure high availability for your services
PART V
Server Cluster Concepts
The nodes in a server cluster can be configured in either active or passive mode An active node is a node that is actively rendering services A passive node is a node that is in standby mode, waiting to respond upon service failure It goes without saying that like the eighth server role presented earlier, the failsafe server, the passive node is a more expensive solution in terms of resources, because the server hardware or the virtual machine is just
Part V:
Secure Windows Server 2008
Product or Service Active Directory Domain Services (ADDS) Active Directory Lightweight Directory Services (ADLDS) BizTalk Server
WSFCAware
WSFCIndependent X
WSFCIncompatible
NLBCompatible
Comment Not recommended; availability is provided through multimaster replication Not recommended; availability is provided through ADLDS replication
BizTalk state server and message box are clusteraware Messaging and processing servers are clusterindependent All other services should use a network load balancing cluster BizTalk can also take advantage of a clustered SQL Server back-end Component load balancing clusters preferred
COM +
Commerce Server
Component load balancing clusters preferred Stand-alone DFS namespaces only Domain DFS namespaces use redundancy provided by ADDS Fully compliant Fully compliant
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