Use a SQL Server cluster for the site database
Applies to: System Center Configuration Manager (Current Branch)
You can use a SQL Server Failover cluster to host the Configuration Manager site database. A cluster provides failover support and improves the reliability of the site database. However, it doesn't provide additional processing or load-balancing benefits. Additionally, a SQL Server Failover cluster uses shared storage and introduces a single point of failure. Degradation in performance can occur, because the site server must find the active node of the SQL Server cluster before it connects to the site database.
Successful set up of SQL Server clusters relies on documentation and procedures provided in the SQL Server documentation library.
Before you install Configuration Manager, prepare the SQL Server cluster to support Configuration Manager. For more information, see Prepare a clustered SQL Server instance.
During Configuration Manager setup, the Windows Volume Shadow Copy Service writer installs on each physical computer node of the Microsoft Windows Server cluster. This service supports the Backup Site Server maintenance task.
After the site installs, Configuration Manager checks for changes to the cluster node each hour. Configuration Manager automatically manages any changes that are found that affect its component installs. For example, a node failover, or the addition of a new node to the SQL Server cluster.
The following options are supported for SQL Server failover clusters used as the site database:
A single instance cluster
Multiple instance configurations
Multiple active nodes
Both a named or a default instance
Be aware of the following prerequisites:
The site database must be remote from the site server. The cluster can't include the site system server.
Starting in version 1810, the Configuration Manager setup process no longer blocks installation of the site server role on a computer with the Windows role for Failover Clustering. Previously you couldn't colocate the site database on the site server. With this change, you can create a highly available site with fewer servers by using a SQL cluster and a site server in passive mode. For more information, see High availability options.
Add the computer account of the site server to the local Administrators group of each server in the cluster.
To support Kerberos authentication, enable the TCP/IP network communication protocol for the network connection of each SQL Server cluster node. The Named pipes protocol isn't required, but can be used to troubleshoot Kerberos authentication issues. The network protocol settings are configured in SQL Server Configuration Manager, under SQL Server Network Configuration.
If you use a public key infrastructure (PKI), see PKI certificate requirements. There are specific certificate requirements when you use a SQL Server cluster for the site database.
Consider the following limitations:
Installation and configuration
Secondary sites can't use a SQL Server cluster.
When you specify a SQL Server cluster, the option to specify non-default file locations for the site database isn't available.
You can't install an instance of the SMS Provider on a SQL Server cluster. It's also not supported on a computer that runs as a clustered SQL Server node.
Data replication options
If you use Distributed Views, you can't use a SQL Server cluster to host the site database.
Backup and recovery
Configuration Manager doesn't support Data Protection Manager (DPM) backup for a SQL Server cluster that uses a named instance. It does support DPM backup on a SQL Server cluster that uses the default instance of SQL Server.
Prepare a clustered SQL Server instance
Here are the main tasks to complete to prepare your site database:
Create the virtual SQL Server cluster to host the site database on an existing Windows Server cluster environment. For specific steps to install and set up a SQL Server cluster, see the documentation specific to your version of SQL Server. For more information, see Create a new SQL Server Failover Cluster.
On each computer in the SQL Server cluster, place a file in the root folder of each drive where you don't want Configuration Manager to install site components. Name the file
NO_SMS_ON_DRIVE.SMS. By default, Configuration Manager installs some components on each physical node, to support operations such as backup.
Add the computer account of the site server to the local Administrators group of each Windows Server cluster node computer.
In the virtual SQL Server instance, assign the sysadmin SQL Server role to the user account that runs Configuration Manager setup.
To install a new site using a clustered SQL Server
To install a site that uses a clustered site database, run Configuration Manager setup following your normal process for installing a site, with the following alteration:
On the Database Information page, specify the name of the virtual SQL Server cluster instance that will host the site database. The virtual instance replaces the name of the computer that runs SQL Server.
When you enter the name of the virtual SQL Server cluster instance, don't enter the virtual Windows Server name created by the Windows Server cluster. If you use the virtual Windows Server name, the site database installs on the local hard drive of the active Windows Server cluster node. This prevents successful failover if that node fails.
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