InfoScale™ 9.0 Storage Foundation and High Availability Solutions HA and DR Solutions Guide for Microsoft SQL Server - Windows
- Section I. Getting started with Storage Foundation and High Availability Solutions for SQL Server
- Introducing SFW HA and the VCS agents for SQL Server
- How is application availability achieved in a VMware virtual environment
- How VCS monitors storage components
- Deployment scenarios for SQL Server
- Reviewing the active-passive HA configuration
- Reviewing a standalone SQL Server configuration
- Reviewing the campus cluster configuration
- Reviewing the Replicated Data Cluster configuration
- About setting up a Replicated Data Cluster configuration
- Disaster recovery configuration
- Reviewing the disaster recovery configuration
- Notes and recommendations for cluster and application configuration
- Configuring disk groups and volumes for SQL Server
- About managing disk groups and volumes
- Configuring the cluster using the Cluster Configuration Wizard
- Installing SQL Server
- Completing configuration steps in SQL Server
- Introducing SFW HA and the VCS agents for SQL Server
- Section II. Configuring SQL Server in a physical environment
- Configuring SQL Server for failover
- About configuring the SQL Server service group
- Configuring the service group in a non-shared storage environment
- Configuring an MSDTC Server service group
- Configuring campus clusters for SQL Server
- Configuring Replicated Data Clusters for SQL Server
- Setting up the Replicated Data Sets (RDS)
- Configuring a RVG service group for replication
- Configuring the resources in the RVG service group for RDC replication
- Configuring the VMDg or VMNSDg resources for the disk groups
- Configuring the RVG Primary resources
- Adding the nodes from the secondary zone to the RDC
- Verifying the RDC configuration
- Configuring disaster recovery for SQL Server
- Setting up your replication environment
- About configuring disaster recovery with the DR wizard
- Configuring replication and global clustering
- Configuring the global cluster option for wide-area failover
- Testing fault readiness by running a fire drill
- About the Fire Drill Wizard
- Prerequisites for a fire drill
- Preparing the fire drill configuration
- Deleting the fire drill configuration
- Configuring SQL Server for failover
Reviewing the MSDTC configuration
Microsoft Distributed Transaction Coordinator (the MSDTC service) enables you to perform distributed transactions. A distributed transaction updates data on more than one computer in a network. The MSDTC service ensures that a transaction is successfully committed on each computer. A failure to commit on a single system aborts the transaction on all systems in the network. If a transaction spans across more than one computer in the network, you must ensure that the MSDTC service is running on all the computers. Also, all the computers must be able to communicate with each other.
MSDTC servers can co-exist with SQL Servers on the same cluster nodes. If the MSDTC server and the SQL Server are running on the same node, the MSDTC client is configured in the default configuration. If the MSDTC Server is not configured on the same node as the SQL Server, then the MSDTC client must be configured on that node. In general, you must configure the MSDTC client on all nodes except the node on which the MSDTC Server is configured. The MSDTC client and the MSDTC server must not run on the same cluster node.
For example, consider a SQL Server configuration in a VCS cluster that spans four nodes and two sets of shared storage. The shared storage is managed using Storage Foundation (SFW).
The following configurations are possible:
SQL Server and MSDTC Server are configured on different nodes
SQL Server is configured on the same node as the MSDTC Server
SQL Server and MSDTC Server are configured on nodes in different clusters
The following figure shows the configuration for SQL Server and MSDTC Server on different nodes.
The following figure shows the configuration for SQL Server configured on the same node as the MSDTC server.
The following figure shows the configuration where SQL Server and MSDTC Server are configured on nodes belonging to different clusters.