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Additional Cluster Capacity In order to provide continuing availability following a node failure, it is necessary for the cluster to have excess capacity This extra capacity can be utilized to support normal operations while the full complement of servers is available However, in the event of a node failure, it will be necessary for the remaining servers to support the workload Note that it may be possible to disable certain activities during the period of restricted availability, such as index creation, statistics generation, purging, and so on It may also be possible to restrict the number of users accessing the system If none of the aforementioned options are possible, then it will be necessary to include one additional server to the cluster for each node failure that the cluster is designed to accommodate.

In most clusters this will be a single system, as the probability of two nodes failing at the same time is relatively low Additional Hardware Costs The cost of server hardware represents only a fraction of the total cost of a RAC cluster There are significant additional costs, which may differ from comparable single-instance scale-up configurations: A data center environment, including power, air-conditioning, and security A storage subsystem This must be configured to provide some form of redundancy A storage infrastructure In many environments this involves providing switches and other devices to implement redundant paths in a storage area network (SAN) Host bus adapters These are effectively network cards that allow the servers to communicate with the SAN Multipathing software This supports multiple routes through the storage network to the storage devices A network infrastructure RAC systems require a minimum of two separate networks.

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Redundant paths are normally provided for networks using network interface card (NIC) teaming Additional networks are provided at some sites for backup traffic and monitoring software Management and monitoring software This is often licensed on a per-server or per-CPU basis Backup software Prior to the introduction of Oracle Backup, additional third-party software was needed to manage tape media Operating system software and support Many large sites have certified product stacks This is a configuration including hardware, operating systems, drivers, and even databases A typical stack might contain between 12 and 15 different layers Each stack costs time and resources to validate, so most users attempt to minimize the number of stacks that are supported A decision to implement a RAC cluster in such an environment will almost inevitably lead to the development of a new product stack Staff and Training Costs You should also consider staff costs.

The entire web site is presented to the world as one address by the load balancers. The worldwide DNS system will take care of routing incoming connections to the load balancers. The ports the load balancers are listening on are the default ports that users will connect to. As a request flows through the system, whenever a process needs to go to another service, it will go via the load balancers, which will always route it to a functioning server. The ports the servers are listening on are those that will be in use following a default Oracle Collaboration Suite installation. The following is the traffic flow for a request from a user to access his e-mail through the web client: 1. The end user issues the URL to contact Oracle Collaboration Suite virtual host: http://ocs.bplc.com This will hit one of the load balancers on port 80. 2. The load balancer routes the URL to one of the middle tier nodes, hitting its Web Cache on port 7777. 3. The Web Cache will route the URL to one of the middle tier Apache web listeners on port 7778. 4. The Apache web listener will redirect the user to the Single Sign-On virtual host, hitting one of the load balancers on port 7777. 5. The load balancer will route the SSO request to one of the infrastructure hosts, hitting its Apache web listener on port 7777.

Existing staff will need to be trained to work with both clusters and Oracle RAC databases Clustering skills are still at a premium and, therefore, it will be more expensive both to retain existing staff and to attract replacements When a RAC environment is introduced, it is also necessary to implement and test new database maintenance procedures, including backup and recovery procedures Any disaster-recovery solution must also be reviewed and retested..

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