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
About configuring and migrating the service group
For a successful wide-area failover, the mount points and applications must fail over to the secondary RDC zone. Additionally, the Volume Replicator secondary disk group and RVG must be imported and started on the secondary RDC zone.
The following figure shows a screen from the VCS Cluster Manager (Java Console) that depicts a typical SQL Server service group RDC configuration.
The following figure shows a screen from the VCS Cluster Manager (Java Console) that depicts a typical SQL Server replication service group (RVG) configuration.
In the RDC configuration, consider a case where the primary RDC zone suffers a total failure of the storage. In this situation, none of the nodes in the primary zone see any device. The service group cannot fail over locally within the primary RDC zone, because the volumes cannot be mounted on any node. The service group must therefore fail over to a node in the current secondary RDC zone.
The RVGPrimary agent ensures that Volume Replicator volumes at the secondary RDC zone are made writable. The application can be started at the secondary RDC zone and run there until the problem with the local storage is corrected. If the storage problem is corrected, you can switch the application back to the primary zone using VCS.
Before switching the application back to the original primary RDC zone, you must resynchronize any changed data from the active secondary RDC zone since the failover. Once the resynchronization completes, switch the service group to the primary zone.