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view of the cluster and of which nodes should be active and offer what services To that end, a cluster has a quorum, which is responsible for maintaining a consistent view and agreed state of the cluster The quorum tells the nodes in the cluster which node(s) are active and, should nodes in the cluster fail to be able to contact each other, the quorum controls who is allowed to still run the application or service (Only one node can own the quorum) To facilitate the quorum, certain cluster resources can contribute to determining whether a con guration has a quorum by casting votes Votes can be assigned to nodes in the cluster, to a shared storage medium (such as a universally accessible SAN via ber, iSCSI, and so on), and to a le share In 2008, there is a single quorum model that has four modes (see the Failover Clustering section) The voting system governs the active status of a cluster and, with Windows Server 2008 (or 2003 SP1 with update 921181), node majority no longer has a three-node minimum You can now use a le share witness, which is a share on a server in the domain of the cluster that holds a vote for the cluster and helps maintain a quorum in the cluster As with NLB, the failover cluster has its own IP address and hostname After the cluster is con gured, cluster resources are added (such as le shares, print shares, disk resources, network names, and addresses) that form the service offered by the cluster They are the resources that failover when a passive node becomes active Other services, like Exchange and SQL, which are cluster-aware have speci c areas of functionality that are cluster-compatible and are added as cluster resources Figure 18-2 shows an example failover cluster for a le server with shared storage via a SAN, which could contain both the data being offered and the quorum Any client request to a share on the cluster is serviced by the active node, which owns the IP address, name of the cluster, and all the cluster resources for the cluster group it is active for (in this case, a le share) Only certain versions of Windows Server 2008 support failover cluster, and there are far less restrictions on the type of hardware supported in a cluster and the network and storage con gurations Make sure all components of a cluster are fully tested for cluster usage FIGURE 18-2 A basic two-node active-passive le cluster.

Windows 2008 has two primary high-availability solutions, but where are these used There are three different ways high availability is achieved for different types of services: services and applications that have high availability built in, those that require Windows clustering to help, and those that rely 100% on Windows clustering Some roles within Windows and other services have high availability built into their architecture and do not require additional help to be highly available A good example is Active Directory Domain Services (ADDS) which has multiple domain controllers that manage their own replication of the directory service content totally independent of the Windows clustering technologies Other services need help from Windows cluster technologies A good example is Exchange 2007, which uses NLB for scalability and availability of its client access servers that service client requests for mail access, both from ActiveSync clients and Web clients The mailbox servers take advantage of the failover clustering capabilities of Windows servers, as only one server can service a particular mail database In the event a mailbox server is unavailable, the passive node in the mailbox server cluster takes over the servicing of the mail databases providing clients access to e-mail With Exchange 2007, there are numerous types of back-end cluster The most basic is the single copy cluster (SCC) scenario, where the databases exist

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CCS::TempType Thermostat_impl:: set_nominal(CCS::TempType new_temp) throw(CORBA::SystemException, CCS::Thermostat::BadTemp) { // Check that the new temperature is within range, and if // so, set the desired temperature to new_temp (not shown) // Create our event data CCS::TStatEvent event_data; event_datats = _this(); event_dataasset_num = m_anum; event_datalocation = location(); event_datatemp = new_temp; // Insert the event data into an any CORBA::Any any; any <= event_data; // Push the event to the event channel Assume that // the "consumer" variable is a reference to our

18

Invocation matching can be made more exible by using matchers as arguments wrapped in with() clauses:

// ProxyPushConsumer obtained from the event channel consumer->push(any); } return new_temp;

on shared storage, such as a SAN, and the nodes in the cluster connect to the shared storage Alternatively, there are technologies, such as Cluster Continuous Replication (CCR), where the mail servers are part of a failover cluster but don t use shared storage; instead, Exchange replication is used to keep a copy of the mail database on both servers synchronized The failover cluster is used only to control which server is running the mailbox servers on their copy of the database Finally, there are services that rely 100% on the windows clustering services, such as le and printer services that use the clustering resources to make their solutions highly available by using shared storage There are other ways to make services more available or more scalable For example, with DNS, clustering can have multiple records for a single hostname that can point to different servers DNS will then roundrobin requests from clients for the name to one of the servers This allows multiple servers to be used for a single hostname; however, this works better for some services than others Imagine that one of the servers is unavailable If the client component is smart enough to attempt communication, it fails, so it tries the next returned resolution from DNS In this case, DNS round robin is not a terrible solution; however, if the client tries only the rst name returned, there is a big problem if it s unavailable Active Directory uses DNS for its availability; each domain controller registers records in DNS, and if a DC is unavailable, the client will timeout and try another Let s look at both technologies in more detail

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