1. SQLCAT: SQL Server HA and DR Design Patterns, Architectures, and Best Practices Using Microsoft SQL Server 2012 AlwaysOn Sanjay Mishra Program Manager Microsoft Corporation DBI316

2. Assumed Pre-requisites for this presentation: Basic knowledge of AlwaysOn Failover Cluster Instances (FCI) AlwaysOn Availability Groups (AG) Definition: For the purpose of this presentation High Availability (Local HA): Availability within a data center Disaster Recovery (DR): Availability across data centers

3. AlwaysOn ≠ Availability Groups AlwaysOn = { SQL Server Failover Cluster Instances, Availability Groups } Availability Groups ≠ Database Mirroring

4. SQL Server 2012 AlwaysOn HA+DR Design Pattern Solution Characteristics Corresponding Pre-SQL Server 2012 Solution 1 Multi-site Failover Cluster Instance (FCI) for HA and DR Shared Storage solution 1 1 Masked by storage replication Multi-site FCI using stretch VLAN 2 Availability Group for HA and DR Non-Shared Storage solution Database Mirroring for Local HA and Log Shipping for DR 3 Failover Cluster Instance for local HA + Availability Group for DR Combined Shared Storage and Non-Shared Storage Failover Cluster Instance for Local HA and Database Mirroring for DR

6. title Multi-site Failover Cluster Instance for HA and DR

7. Primary Site DR Site Node 1 Node 2 Node 3 Node 4 Windows Server Failover Cluster Storage Replication SQL-FCI ActivePassive SQL Server 2012 AlwaysOn HA+DR Solution Solution Characteristics Corresponding Pre-SQL Server 2012 Solution 1 Multi-site Failover Cluster Instance (FCI) for HA and DR ( http://sqlcat.com/sqlcat/b/whitepaper s/archive/2011/12/22/sql-server-2012- alwayson_3a00_-multisite-failover- cluster-instance.aspx ) http://sqlcat.com/sqlcat/b/whitepaper s/archive/2011/12/22/sql-server-2012- alwayson_3a00_-multisite-failover- cluster-instance.aspx Shared Storage solution 1 Instance Level HA (automatic) Instance Level DR (automatic 2 ) Uses storage replication 1 Masked by storage replication 2 Consider 3 rd data center Multi-site FCI using stretch VLAN

8. Multi-site Failover Cluster Instance Key Elements A single SQL Server failover cluster instance (FCI) providing HA as well as DR spanning across multiple sites (usually multiple subnets as well) Key components: Storage Storage level replication Cluster Enabler Provided by the storage vendor Work with your storage vendor to get the appropriate software and best practices Network Multi-subnet support in SQL Server configuration and engine Key improvement in SQL Server 2012 IP address OR dependency set within SQL Server setup SQL Engine skips binding to any IP’s which are not online at start-up RegisterAllProvidersIP for Network Name improves application failover time

9. Multi-site Failover Cluster Instance Deployment Considerations

11. title Availability Groups for HA and DR

12. SQL Server 2012 AlwaysOn HA+DR Solution Solution Characteristics Corresponding Pre-SQL Server 2012 Solution 2 Availability Group for HA and DR Non-Shared Storage solution (Group of) Database Level HA (automatic) (Group of) Database Level DR (manual 3 ) DR replica can be Active Secondary 3 DR is manual, if HA is chosen automatic. Consider 3 rd data center, if need automatic DR. Database Mirroring for Local HA and Log Shipping for DR

13. Availability Groups for HA and DR Deployment Considerations

14. Availability Groups for HA and DR Quorum Considerations

16. Note: The Fileshare Witness always has 1 vote. Quorum Model and Node Votes Node and Fileshare Majority Use the “Node and File Share Majority” quorum model with a protected file share witness.

17. Quorum Model and Node Votes Node Majority Add an additional voting node to the WSFC in the primary data center, and then use the “Node Majority” quorum model.

18. Quorum Model and Node Votes How to set / view To View Quorum Model Windows Failover Cluster Manager GUI PowerShell Cluster.exe SQL Server DMVs AlwaysOn Dashboard in SSMS To Change Quorum Model Windows Failover Cluster Manager GUI PowerShell Cluster.exe To View Node Votes PowerShell Cluster.exe SQL Server DMVs AlwaysOn Dashboard in SSMS To Change Node Votes PowerShell Cluster.exe

19. Recovering from a Disaster

20. Migration: From DBM+LS to AG Planning and Key Considerations

22. title Failover Cluster Instance for HA, and Availability Group for DR

24. FCI for HA + AG for DR SQL Server 2012 AlwaysOn HA+DR Solution Solution Characteristics Corresponding Pre-SQL Server 2012 Solution 3 Failover Cluster Instance for local HA + Availability Group for DR Combined Shared Storage and Non-Shared Storage Instance Level HA (automatic) (Group of) Database Level DR (manual) DR replica can be Active Secondary Asymmetric storage is the key to this solution Failover Cluster Instance for Local HA and Database Mirroring for DR

25. FCI for HA + AG for DR Deployment Considerations

27. FCI for HA + AG for DR Quorum Considerations

29. Note: The Fileshare Witness always has 1 vote. Quorum Model and Node Votes Example: Node and Fileshare Majority

30. Quorum Model and Node Votes How to set / view To View Quorum Model Windows Failover Cluster Manager GUI PowerShell Cluster.exe SQL Server DMVs AlwaysOn Dashboard in SSMS To Change Quorum Model Windows Failover Cluster Manager GUI PowerShell Cluster.exe To View Node Votes PowerShell Cluster.exe SQL Server DMVs AlwaysOn Dashboard in SSMS To Change Node Votes PowerShell Cluster.exe Note: Only cluster.exe can be used to set quorum model to “Node and (asymmetric) Disk Majority” or “(asymmetric) Disk Only”

31. Recovering from a Disaster

32. Migration: From FCI+DBM to FCI+AG Planning and Key Considerations

33. Summary

34. SQL Server 2012 AlwaysOn HA+DR Design Pattern Solution Characteristics Corresponding Pre-SQL Server 2012 Solution 1 Multi-site Failover Cluster Instance (FCI) for HA and DR Shared Storage solution 1 Instance Level HA (automatic) Instance Level DR (automatic 2 ) Uses storage replication Doesn’t require database to be in FULL recovery model 1 Masked by storage replication 2 Consider 3 rd data center Multi-site FCI using stretch VLAN 2 Availability Group for HA and DR Non-Shared Storage solution (Group of) Database Level HA (automatic) (Group of) Database Level DR (manual 3 ) DR replica can be Active Secondary Requires database to be in FULL recovery model 3 DR is manual, if HA is chosen automatic. Consider 3 rd data center, if need automatic DR. Database Mirroring for Local HA and Log Shipping for DR 3 Failover Cluster Instance for local HA + Availability Group for DR Combined Shared Storage and Non-Shared Storage Instance Level HA (automatic) (Group of) Database Level DR (manual) DR replica can be Active Secondary Requires database to be in FULL recovery model Asymmetric storage is the key to this solution Failover Cluster Instance for Local HA and Database Mirroring for DR

37. Sanjay Mishra sanjaymi@microsoft.com www.sqlcat.com @sqlcat

38. Connect. Share. Discuss. http://northamerica.msteched.com Learning Microsoft Certification & Training Resources www.microsoft.com/learning TechNet Resources for IT Professionals http://microsoft.com/technet Resources for Developers http://microsoft.com/msdn

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