generate barcode using vb.net Lesson 2: Designing SQL Server 2005 Failover Cluster Instances in Visual C#

Encoder UPC A in Visual C# Lesson 2: Designing SQL Server 2005 Failover Cluster Instances

Lesson 2: Designing SQL Server 2005 Failover Cluster Instances
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Each SQL Server instance installed into a cluster requires a unique IP address, which needs to be on the public network segment configured in the cluster. Bound to each IP address is a unique network name that will be registered into DNS so the SQL Server can be resolved by name.
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SQL Server 2005 installs a new service called the SQL Browser service. If you have installed named instances in a cluster, the SQL Browser service must be running to resolve these names. If you do not have named instances, you should disable the SQL Browser service.
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You must configure each SQL Server clustered instance with a dedicated set of drive letters. On a stand-alone server, multiple instances can store databases on the same drive or even in the same directory as other instances. In a cluster, the drives are mounted to a particular node at any given time. Any other node does not have access to those drives. You can configure an instance of SQL Server to run on any node. If you could configure more than one SQL Server clustered instance to store databases on the same drive letter, it would be possible to create a configuration in which the instance is running on one node while another node has ownership of the disks, thereby rendering the SQL Server instance inoperable. The concept of disk configurations in a SQL Server cluster is known as the instanceto-disk ratio. Although a SQL Server cluster instance can address more than one drive letter, a drive letter can be associated to only a single SQL Server cluster instance. Additionally, a drive letter must be configured as a dependency of the SQL Server ser vice being allowed to store databases.
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You need to configure each SQL Server service with a service account. You should gen erally use a different account for each SQL Server service such as SQL Server, SQL Server Agent, and Full Text. Although the accounts do not need any special privileges, they must be domain accounts because the Security Identifier (SID) for a local account cannot be resolved on another machine.
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8
Failover Clustering
SQL Server 2005 changes the way Windows permissions are handled for service accounts. In previous versions of SQL Server, permissions were granted directly to the SQL Server related service accounts. Because the service accounts needed to have administrative authority on the machines, it did not pose a significant issue. SQL Server 2005 does not require service accounts with administrative authority in Windows. This has created a situation in which a Windows account could have doz ens of individual permissions granted to it, such as registry access, directory access, and file access permissions. Changing service accounts would become very compli cated because you would have to assign all these individual permissions to the new service account to ensure that services continue to function normally. With the shift in the security infrastructure, the Windows accounts for SQL Server 2005 services are designed to follow industry-accepted practices for managing Win dows accounts. Windows groups are granted permissions on the various resources that will be accessed. Windows accounts are then added to their respective groups to gain access to resources. On a stand-alone machine, these groups are created by default of the form SQLServer2005MSSQLUser$<machine name>$<instance name>, SQLServer2005 SQLAgentUser$<machine name>$<instance name>, and SQLServer2005MSFE User$<machine name>$<instance name>. SQL Server Setup automatically assigns permissions on the directories, registry keys, and other resources needed to allow a SQL Server to function to the appropriate group. It then adds the service account to the respective group. Although this process works on a stand-alone machine, it is not as simple in a cluster. Within the cluster, a SQL Server failover cluster instance can be running on any phys ical machine in the cluster. Local Windows groups do not have a valid security con text across machines. Therefore, the groups for the SQL Server service accounts need to be created at domain level. The installation routine does not assume that you have the authority to create groups in the domain. You need to create these domain groups prior to installing a SQL Server failover cluster instance. You have to define three groups within the domain that have the following purposes:
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