Narasimha Reddy Gopu Jisha J

Agenda Introduction to AlwaysOn * AlwaysOn Availability Groups (AG) & Listener * AlwaysOn Failover * AlwaysOn Active Secondaries Improved Failure Detection Beyond AlwaysOn Summary *Demo

Mission Critical High Availability Solution Meets the Business SLAs(Service Level Agreements) RPO and RTO Planned and Un-planned Downtime Flexible A unified, simplified solution Easy to deploy and Manage IntegratedEfficient Improved Hardware Utilization Improved IT Efficiency

AlwaysOn AlwaysOn Availability Groups for Database Protection AlwaysOn Failover Instances for Instance Protection HADR(High Availability and Disaster Recovery) feature To be released as part of SQL Server 2012(Denali)

AlwaysOn Availability Groups Combines the best of Database Mirroring and Log shipping Windows Server Failover Cluster Database Active Log Synchronization Database Active Log Synchronization

A Flexible Solution

An Integrated Solution

An Efficient Solution

Demo

Application Failover Availability Groups Listener allow applications to failover to any secondary node/s Application uses a virtual name for the failover

AlwaysOn Failover AlwaysOn Cluster Server A Server B Server C Listener Availability Group DB Primary Secondary

Demo

AlwaysOn – Active Secondary Improve IT efficiency by avoiding idle hardware Multiple Secondaries may be used for Offloading Backup operations Balancing Read-only workloads

Offloading Backup Operations Backups can be done on the primary as well as any of the secondaries Log backups done on all replicas form a single log chain

Demo

Balancing Read-only Workloads Readable secondary feature enable offloading read queries to multiple secondary nodes Latency of log synchronization can impact data freshness on Asynchronous Secondary Databases.

Demo

Improved Failover Detection Monitoring Failure Dedicated connection on a new Thread for monitoring Health Status proc execution in Repeat mode to gather ( SQLDIAG logs) For Failure DetectionFor Diagnostic Only a) Systemd) IO-Subsystem b) Resourcee) Events c) Query Process Determining Failure: Basic resource health check interval(Looks Alive Poll) and Thorough resource health check interval (Is Alive Poll) Action:- FailoverConditionLevel setting value (0-5, 3 default) takes required action (Restart or Fail Over) based on the detected health status`. Ex: 3 :- SQL Server Down + SQL Server Un responsive(Timeout for SP_Server_Diagnostics) + ‘System Error ‘ for SP_Server_Diagnostics

Beyond AlwaysOn Integrating Contained Databases with AlwaysOn No more orphaned DB users, Logins DB users with passwords replace the SQL Logins Native Support for Multi-site Clustering ‘OR ‘ Logic in Dependency tab 3 rd party Replication between the Storage/servers Support TEMPDB on local drive Support for Windows Server Core Reduce OS patching by as much as 50-60%

Summary HA & DR Solution Flexible, Integrated, Efficient technology Offloading Read Only/Reporting operations Offloading Backup Operations

References Microsoft SQL Server site SQL Server 2012 Release Candidate 0 SQL Server 2012 high availability site critical/SQL-Server-2012-high-availability.aspx Microsoft TechEd 2011 Events

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