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What are the resource orchestration strategies in disaster recovery scenarios?

Created on 2025-06-24 10:46:33
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In disaster recovery (DR) scenarios, resource orchestration strategies ensure minimal downtime and data loss by automating the failover, recovery, and restoration of IT resources. Key strategies include:

  1. Hot Standby (Active-Active):

    • Resources are actively running in both primary and secondary sites, synchronizing data in real time. Failover is near-instantaneous.
    • Example: A global e-commerce platform uses hot standby databases in two regions, with traffic automatically routed to the healthy site during outages.
    • Tencent Cloud Service: Use Tencent Cloud Redis Cluster with cross-region replication for real-time data synchronization.

  2. Warm Standby (Active-Passive):

    • Secondary resources are idle or partially active, ready to take over when needed. Recovery time is longer than hot standby but more cost-effective.
    • Example: A financial service maintains a warm standby application server in a different zone, activated during primary site failures.
    • Tencent Cloud Service: Deploy Tencent Cloud CVM (Cloud Virtual Machine) with auto-scaling groups in a secondary region.

  3. Cold Standby:

    • Secondary resources are offline and require manual or scripted activation. This is the cheapest but slowest recovery method.
    • Example: A backup data center with taped storage activated only after a major disaster.
    • Tencent Cloud Service: Use Tencent Cloud CBS (Cloud Block Storage) snapshots stored in a separate region for restoration.

  4. Pilot Light:

    • A minimal version of the application runs continuously in the secondary site, allowing faster scaling during failover.
    • Example: A SaaS provider keeps a lightweight database instance running in a backup region, scaling up when needed.
    • Tencent Cloud Service: Leverage Tencent Cloud TKE (Tencent Kubernetes Engine) to maintain a minimal cluster in standby mode.

  5. Multi-Site Active (Geo-Redundancy):

    • Applications are distributed across multiple regions, with traffic dynamically routed based on health checks.
    • Example: A video streaming service uses CDN nodes in multiple continents, switching users to the nearest healthy node.
    • Tencent Cloud Service: Utilize Tencent Cloud CLB (Cloud Load Balancer) with global traffic distribution.

For automation, Tencent Cloud CAM (Cloud Access Management) and Tencent Cloud API Gateway can orchestrate failover workflows, while Tencent Cloud Monitor detects outages and triggers recovery actions.