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Implementing Multi-Site Clusters

Implementing Multi-Site Clusters. April 14 20111. Trần Văn Huệ Nhất Nghệ CPLS. Overview of Multi-Site Clusters. What Are Multi-Site Clusters? What Makes Multi-Site Clusters Unique? Why Use a Multi-Site Cluster? Evaluating the Business Need for a Multi-Site Cluster

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Implementing Multi-Site Clusters

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  1. Implementing Multi-Site Clusters April 14 20111 Trần Văn Huệ Nhất Nghệ CPLS

  2. Overview of Multi-Site Clusters • What Are Multi-Site Clusters? • What Makes Multi-Site Clusters Unique? • Why Use a Multi-Site Cluster? • Evaluating the Business Need for a Multi-Site Cluster • Storage Challenges for Multi-Site Clusters • Synchronous / Asynchronous Replication? • Network Challenges for Multi-Site Clusters • Choosing the Appropriate Quorum Mode in Multi-Site Clusters • Demo: Deploying a Multi-Site Cluster Agenda:

  3. What Are Multi-Site Clusters? SAN SAN A multi-site cluster is a cluster that has been extended so that different nodes in the same cluster reside in separate physical locations Site A Site B

  4. What Makes Multi-Site Clusters Unique? • Multiple storage arrays, which are independent in each site • Nodes commonly access storage local to their own sites • Storage is replicated between sites • No “true” shared disk is visible to all nodes Site A Site B Changes are made on Site A and replicated to Site B Replica

  5. Why Use a Multi-Site Cluster?

  6. Evaluating the Business Need for a Multi-Site Cluster • Because of increased cost and complexity, multi-site clusters aren’t for every company or application • Evaluate the application type and importance, and consider available alternatives • Plan for the application and hardware architecture, and for routine failover and failback testing

  7. Storage Challenges for Multi-Site Clusters

  8. What Is Synchronous Replication? Data Data When you use synchronous replication, the host receives a “write complete” response from the primary storage after the data is written successfully to both storage locations Site A Site B Replication WriteRequest WriteComplete SecondaryStorage PrimaryStorage Acknowledgement

  9. What Is Asynchronous Replication? Data Data When you use asynchronous replication, the host receives a “write complete” response from the primary storage after the data is written successfully on the primary storage Site A Site B Replication WriteRequest WriteComplete SecondaryStorage PrimaryStorage

  10. Comparing Synchronous and Asynchronous Replication

  11. Network Challenges for Multi-Site Clusters • Inter-node communications are time sensitive; you might need to configure these thresholds to meet the higher WAN latency • DNS replication might impact client reconnect times when failover is based on hostname • Active Directory replication latency might effect application data availability • Some applications might require all of the nodes to be in the same Active Directory site

  12. Choosing the Appropriate Quorum Mode in Multi-Site Clusters

  13. Using Node and File Share Majority in a Multi-Site Cluster SAN SAN WAN Site A Site B • File share witness allows a 2-node cluster with no shared disk • Single file server can serve as the witness for multiple clusters File Share Witness Site C Third-Party Replication Mechanism

  14. Deploying a Multi-Site Cluster When deploying multi-site clusters: Ensure that the business requirements are met by the solution ü Use a hardware vendor to create a full solution for multi-site clusters ü Choose the correct quorum mode to properly maintain functionality in the event of failures ü Choose the correct storage replication solution to meet these needs ü

  15. Demo Demo: Multi Site Cluster

  16. Demo PC08: DC, Quorum IP: 192.168.1.8 Site 3 Public network: 192.168.1.0/24 PC10: IP: 192.168.1.10 IP: 172.16.1.10 PC09: IP: 192.168.1.9 IP: 172.16.1.9 Site 2 Private network: 172.16.1.0/16 Site 1 Datakeeper replicate

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