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All health checks within a cluster use RPC. If the RPC service is unavailable or has been disabled, all health checks within a cluster fail. You must ensure that the RPC service is enabled and set to auto matically start on all nodes within a cluster.
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You can separate cluster resources, which are the most granular items that you can configure within a cluster, into the broad categories shown in Table 8-4.
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Table 8-4
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Examples IP address, network name Disk drives Services, executable files, file shares, MS DTC
Resources that are physically attached to a machine cannot be configured in a cluster, so you might wonder how disk drives can be defined as a cluster resource. As described in the Disk Configuration section, all data within a cluster must reside on an external drive array. The external drive array can be a Fibre channel cabinet attached to each node in the cluster or a SAN that is connected to all nodes in the clus ter. You cannot configure the local hard drive in each node as a cluster resource. The physical disk drives within the disk array are not the actual cluster resources. The disk mount definition within Windows is configured and controlled by Windows clustering. Although a disk resource is defined on all nodes, only the node that is con figured to own the disk resource has the disks mounted and accessible. All other nodes maintain the disk mount definition but have the disks unmounted, which pre vents more than one machine from writing to the same media at the same time. The main resource that is configured in a cluster is a service such as SQL Server or SQL Server Agent. Although each node in the cluster has an entry for a given service, it is started only on a single node within the cluster. One of the most powerful elements within a cluster is the way in which IP addresses and network names are handled. Although each node in the cluster carries the IP address and network name definition, only the node designated as the owner of the IP address and name has it bound to a physical network card. When a failover occurs to another node, clustering performs the following operations on the network stack: 1. Unregisters the network name from DNS. 2. Binds the IP address to a physical network card on the operational node. 3. Reregisters the network name in DNS.
Lesson 1: Designing Windows Clustering
This process ensures that all applications maintain the same IP address and network name, regardless of the piece of hardware on which they are currently running. By preserving the same IP address and network name through a failover, you do not need to reconfigure applications to reconnect following a failover.
Cluster Groups
You use cluster groups to combine one or more cluster resources into a logical man agement structure. The unit of failover within a cluster is a group. It can be helpful to think of a cluster group as an application. Each SQL Server failover cluster instance that you create appears as a separate group within a Windows cluster. A cluster group, along with the resources contained within the group, is shown in Figure 8-2.
Figure 8-2
Cluster group and associated cluster resources
Quick Check
1. What is the main difference between a standard cluster and a majority node set cluster 2. What are some examples of cluster resources
8
Failover Clustering
3. How many network connections does a node need for clustering Why 4. How does the health check within a Windows cluster work 5. Which types of disk configurations are supported for clustering
Quick Check Answers
1. A standard cluster uses a shared quorum database. A majority node set cluster maintains a separate quorum database on each node that is syn chronized across all nodes. The majority of nodes (more than 50 percent) must be online for a majority node set cluster to function. 2. Cluster resources can be hardware, software, or networking. Some exam ples are IP addresses, network names, disk mounts, and Windows services. 3. Each node needs at least two network connections: One connection is used for public communications to applications on the network, and the other is used for private internal communications. 4. The basic health check that is performed is called a LooksAlive test. This test consists of each node pinging the others. 5. Clustering supports basic disks. Dynamic disks are not supported. Disks must also be external to each node within the cluster, so disks mounted locally within a cluster are not visible to any resource within a cluster.
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