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Clustering Service WS08 edition
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Network Load Balancing Web Standard Enterprise Datacenter Up to 32 Minimum of two network adapters Application Servers (stateless) Dedicated Web Servers Collaboration Servers (front end) Web Farms Internet Security and Acceleration Server (ISA) Virtual Private Network (VPN) Servers Streaming Media Servers Unified Communications Servers
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Failover Clusters Enterprise Datacenter
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Number of nodes Resources Server Role
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Up to 16 SCSI or iSCSI disk connectors Application Servers (stateful) File and Print Servers Collaboration Servers (storage) Network Infrastructure Servers SQL Servers Exchange Servers Message Queuing Servers
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TABLE 11-1 WS08 Clustering Services for VSOs
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Scalability With a cluster, it is possible to increase the number of servers providing the service offering without affecting the service being delivered to users Maintenance A cluster allows IT personnel to upgrade, modify, apply service packs, and otherwise maintain cluster components individually without affecting the service level of service offerings delivered by the cluster An advantage that failover clusters have over NLB clusters is the ability to share data Failover cluster resources must be tied to the same data storage resource, ensuring the transparency of the failover process Clusters do have disadvantages They are more complex to stage and manage than stand-alone servers, and services that are assigned to clusters must be cluster-aware in order to take advantage of the clustering feature
Network Load Balancing
The basis of the NLB cluster is a virtual IP address: Client systems connect to the virtual IP address, and the NLB service redirects the client to a cluster member If a cluster member fails or is taken offline, the NLB service automatically redirects requests to the other cluster members When the member comes back online, it automatically rejoins the cluster and requests can be redirected to it In most cases, the failover process the process of redirecting clients to other cluster resources when a member fails takes less than ten seconds NLB cluster members do not share components They are independent servers that host the same applications and identical local copies of the data client systems access This is why NLB is best suited to stateless applications applications that provide access to data mostly in read-only mode NLB servers normally use two network interface cards The first is dedicated to cluster network traffic, and the second is for communications with clients and other normal network communications Cluster network traffic from the member is mostly in the form of a heartbeat signal that is emitted every second and sent to the other members of the cluster If a member does not send a heartbeat within a time span of five seconds, the other members automatically perform a convergence operation to remove the failed member from the cluster and eliminate it from client request redirections
TIP You can add more than one network interface card (NIC) for client access, but two are the
minimum configuration you should run
NOTE If you decide to build hardware-based service offerings for some reason, then consider this in the
selection of the hardware configuration for the servers Since each cluster member uses identical data, it is often useful to optimize the server hardware to support fast read operations For this reason, many organizations planning to use hardware-based NLB clusters do not implement RAID disk subsystems because redundancy is provided by cluster members Disk access is optimized because there is no RAID overhead during read operations It is essential, however, to ensure that all systems are fully synchronized at all times Whether or not you decide to construct NLB servers without RAID protection is a decision you will make when designing your NLB architecture It will depend mostly on your data synchronization strategy, the type of service you intend to host on the server, and the number of servers you intend to place in your NLB cluster
11:
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Since the NLB servers are VSOs, you do not need to make any special hardware considerations, though you should create identical virtual machines to provide the service offering The core of the NLB service is the wlbssys driver This is a driver that sits between the network interface card and network traffic It filters all NLB communications and sets the member server to respond to requests if they have been directed to it NLB is similar to round-robin DNS, but it provides better fault tolerance Round-robin DNS relies on multiple DNS entries for a service When clients require a connection, the DNS service provides the first address, then the second, then the third, and so on It cannot check to see if the address actually resolves This is one reason why NLB is better It always checks destination addresses to ensure the server is available when redirecting clients And, since the NLB service is hosted by every cluster member, there is no single point of failure There is also immediate and automatic failover of cluster members
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