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Version: 4.0.0

Multi-Site Failover

Introduction​

The Multi-Site Failover setup ensures data protection and availability by replicating data from a primary site to two additional sites. This configuration provides multiple failover options to maintain access to data in case of site outages.

This document provides clear instructions for setting up Multi-Site Failover replication. It is designed to help you implement the process step-by-step, ensuring reliable data failover and recovery between the clusters involved.

Prerequisites​

To successfully implement a Multi-Site Failover setup, the following prerequisites must be met:

  1. DNS Configuration

    • Create triple Name Server (NS) delegation records.
    • Ensure NS records point to the Subnet Service IPs of each cluster and subnet participating in the failover process.

  2. Eyeglass Hints (igls-hints)

    • Configure unique igls-hints on all three clusters for each Access Zone.
    • These hints map IP pools and SmartConnect names during failover.

  3. SmartConnect Zone Placeholders

    • On the target clusters, set up SmartConnect zone placeholders using the naming convention:
      igls-original-<SmartConnect Zone name on source cluster>.
    • This ensures consistent network configuration during failover.

  4. Replication Policies

    • Implement overlapping source path replication policies.
    • Configure data replication from the primary cluster (Site A) to both secondary clusters (Sites B and C).

  5. Active Directory (AD) Configuration

    • Ensure all clusters use the same AD provider within a single AD forest.
    • Extend AD delegation to the third cluster, granting each cluster write permissions to its own computer account and the computer accounts of the other two clusters.

Logical Diagrams for Multi-Site Failover​

Logical diagrams are available to provide a clearer understanding of the Multi-Site Failover configuration. These resources visually represent the relationships between the primary and secondary sites, detailing how data flows between clusters and how failover mechanisms operate. A dedicated document, linked to below, offers comprehensive diagrams and step-by-step workflows that cover critical aspects of the setup, including:

  • Three-Site Replication Pathways: Illustrating data replication from the primary site to two secondary sites.
  • Failover and Failback Processes: Outlining the sequence of actions taken during site outages and recovery.
  • DNS and Active Directory Integration: Explaining how these elements are configured to maintain seamless functionality during failover events.

These visual aids provide a detailed representation of the architecture and mechanics of Multi-Site Failover, supporting implementation and troubleshooting.

Logical Diagrams for Multi-Site Failover

View detailed logical diagrams and workflows for Multi-Site Failover, including replication configurations, failover sequences, and network integration steps.

View Diagrams

Once you’ve reviewed the diagrams, proceed to the next step to configure Access Zone Failover SyncIQ for your three-site environment.

Access Zone Failover SyncIQ Config for 3 Site​

Configuring Access Zone Failover with SyncIQ across three sites ensures robust data replication and high availability. This setup allows for flexible failover options between multiple clusters, enhancing disaster recovery capabilities.

For instructions and best practices on setting up Access Zone Failover with SyncIQ in a multi_site configuration, please refer to the detailed guide linked below.

Access Zone Failover SyncIQ Configuration Guide

Detailed steps and considerations for configuring Access Zone Failover with SyncIQ across three sites, including prerequisites and procedural guidelines.

View Guide

DFS Mode Failover Configuration for 3 Site​

For a guide on configuring and managing DFS Mode Failover in a multi-site setup, including step-by-step procedures for failover and failback, refer to the following article:

Multi-Site DFS Mode Failover

Explore detailed steps and best practices for configuring DFS Mode Failover in a 3-site environment, including initial setup, failover, and failback processes.

View Guide

See Also​

For more guidance related to individual failover methods, refer to the articles on AZ Failover Configuration, Policy Failover Configuration, and DFS Failover Configuration.