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Products of this store will be shipped directly from Hong Kong to your country. Products of this store will be shipped directly from Kuwait to your country. They also run the Cluster Service, which is a special piece of software that makes clustering possible. Clusters have a number of shared resources , including a name for the cluster, a unique IP address for the cluster, the external storage subsystem, and so forth.
Each node runs its own copy of the operating system, as well as a private copy of any clustered applications such as SQL Server. Application data is shared between the nodes, and is stored on the external storage subsystem.
When you power up the first node in a cluster, it figures out that the other node isn't running, and takes control of the cluster's shared resources. That means the first node gains exclusive access to the external storage subsystem, and the first node responds to incoming traffic directed at the cluster's name and IP address. In this state, the first node is said to be the active node , since it is doing the work in the cluster.
The first node starts sending out a heartbeat signal over the cluster's private network connection, as well. When you power up the second node, it detects the heartbeat signal and configures itself as the passive node. The passive node remains connected to the external storage subsystem, but doesn't actually have any access to the data on it.
Also, any clustered applications on the second node are stopped.
trucabinratigna.tk The passive node's job is a lot like the vice president's: Wait for the active node to fail. The passive node monitors the heartbeat coming from the active node.
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If the heartbeat stops for more than a second or two, the passive node sends a reset signal over the shared connection to the external storage subsystem. If the active node is still functioning, it will see that reset signal and perform its own reset, reasserting control over the cluster. However, if the active node has failed, the passive node will gain control of the external storage subsystem and begin the process of failover.
During failover, the passive node takes ownership of all cluster resources that were previously owned by the active node. The node is aided in this task by the quorum resource , a special set of data written to the external storage subsystem that contains cluster configuration information. The now-active second node starts all clustered applications, which are able to access their data on the external storage subsystem. The active node also begins responding to the cluster name and IP address.
The cluster's new operational mode is shown in Figure 3. Failover generally takes about 30 seconds, depending on how long the clustered applications require to start. Client computers attempting to access the cluster may notice a brief delay, but the failover usually occurs quickly enough to prevent any client errors. With the failed node officially out of the loop, an administrator can take corrective action such as replacing any failed hardware without affecting the services that the cluster provides to the network.
Once the failed node is fixed, the administrator can transfer cluster operations back to it by commanding the Cluster Service to perform a failback operation. The administrator can even configure failback to occur automatically at a designated time, such as during less-busy evening hours.
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Some administrators will build clusters using different servers. A more powerful server acts as the primary node, while a less powerful and less expensive server acts as the failover node. This technique allows you to build less expensive clusters. In the event of a failure, the performance of clustered applications might not be as good, but the applications will continue to run until you can repair the more powerful primary node.
At first glance, clusters seem to be an awfully expensive way to provide fault tolerance on a network. After all, one pretty powerful server is just sitting there most of the time, waiting for its cluster partner to fail. These so-called active-passive clusters are very expensive, and few companies choose to use them. Instead, many companies prefer to build active-active clusters.