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virtual techdays

INDIA │ 28-30 September 2011. virtual techdays. High Availability - A Story from Past to Future. Balmukund Lakhani │ Technical Lead – SQL Support, Microsoft blakhani@microsoft.com | http://SQLServer-Help.com |. INDIA │ 28-30 September 2011. virtual techdays.

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virtual techdays

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  1. INDIA │ 28-30 September2011 virtual techdays High Availability - A Story from Past to Future Balmukund Lakhani │ Technical Lead – SQL Support, Microsoft blakhani@microsoft.com| http://SQLServer-Help.com |

  2. INDIA │ 28-30 September2011 virtual techdays • Working with SQL Technology since 2001 (almost 10 years) • Currently working as Technical Lead with Microsoft SQL Support team • Premier Field Engineer @ Microsoft • ERP Onsite Support @ RamcoSystems • DBA @ RamcoSystems • Developer @ RamcoSystems • Team Blog – http://blogs.msdn.com/SQLServerFAQ • Personal Blog – http://SQLServer-Help.com • Active Participant in MSDN SQL Forums. A B O U T M E…

  3. INDIA │ 28-30 September2011 virtual techdays • Why High Availability? • The Past… Quick Recap • Log-Shipping • Database Mirroring • Failover Clustering • Replication • Database Snapshot • The Future… In Depth • High Availability and Disaster Recovery Solution in SQL Server “Denali” S E S S I O N A G E N D A

  4. INDIA │ 28-30 September2011 virtual techdays Why High Availability?

  5. INDIA │ 28-30 September2011 virtual techdays Mission Critical High Availability Solution Meets mission critical high availability SLA Integrated Flexible Efficient RPO and RTO requirements Planned and unplanned downtime Local HA and disaster recovery A unified, simplified solution Easy to deploy and Manage Reuse existing investment SAN vs.. DAS environments Cost Effective HA hardware Utilization No idle systems Improve IT efficiency

  6. INDIA │ 28-30 September2011 virtual techdays High Availability Solutions… The past !

  7. Copy Copy Copy INDIA │ 28-30 September2011 virtual techdays L O G – S H I P P I N G Copy and Restore Backups Perform Backups Secondary Database Copy and Restore Backups Secondary Database Primary Database Copy and Restore Backups Raise Alerts Secondary Database Monitor Database

  8. Commit >3 >2 3 1 5 4 2 2 Application SQL Server SQL Server INDIA │ 28-30 September2011 virtual techdays DATABASE MIRRORING Mirror is always redoing – it remains current Witness Principal Mirror Log Data Log Data

  9. INDIA │ 28-30 September2011 virtual techdays O T H E R T E C H O N O L I G E S

  10. INDIA │ 28-30 September2011 virtual techdays • Replication • Database Snapshots • Failover Clustering O T H E R T E C H O N O L I G E S

  11. INDIA │ 28-30 September2011 virtual techdays Database Mirroring E X I S T I N G T O P O L O G Y Log Shipping

  12. INDIA │ 28-30 September2011 virtual techdays High Availability Solutions… The Future!

  13. INDIA │ 28-30 September2011 virtual techdays • AlwaysOn Availability Groups is a new feature that enhances and combines database mirroring and log shipping capabilities AlwaysOn Availability Groups (Future of High Availability) Flexible Integrated Efficient • Multi-database failover • Multiple secondaries • Total of 4 secondaries • synchronous secondaries • 1 automatic failover pair • Synchronous and asynchronous data movement • Built in compression and encryption • Automatic and manual failover • Flexible failover policy • Automatic Page Repair • Application failover using virtual name • Configuration Wizard • Dashboard • System Center Integration • Rich diagnostic infrastructure • File-stream replication • Replication publisher failover • Active Secondary • Readable Secondary • Backup from Secondary • Automation using power-shell

  14. INDIA │ 28-30 September2011 virtual techdays Configure AlwaysOn Availability Group Demo – Setting up AlwaysOn

  15. INDIA │ 28-30 September2011 virtual techdays • Replace Database Mirroring and Log Shipping with Availability Group • Advantages: • One integrated solution for HA and DR • Groups of databases failing over together • Multiple secondaries • Listener for Client Connectivity • Backup on secondary • Readable secondary • Restrictions: • No delayed apply on the secondary What we did in demo?

  16. INDIA │ 28-30 September2011 virtual techdays • All SQL servers (including the secondary in the DR site) in the same Windows domain. • One Windows Server Failover Cluster spreads over the primary and DR sites • All the databases must be in FULL recovery model • To create WFSC cluster user running creation must have: • Domain account • Administrator on all machines • Have Create Computer objects and Read All Properties rights in AD • Detailed Article: http://technet.microsoft.com/en-us/library/cc731002(WS.10).aspx • KB 976097 • Supports SQL Server Failover Cluster Instances with AlwaysOn Availability Groups • KB 2494036 • Supports configuring optimal quorum with non-automatic failover targets P r e – r e q u i s i t e s

  17. INDIA │ 28-30 September2011 virtual techdays N E W T O P O L O G Y A A A

  18. INDIA │ 28-30 September2011 virtual techdays • Better SLAs • Multiple no data loss secondaries • Better data loss protection for DR secondaries through continuous replication • Faster failover to DR secondaries through virtual name failover • Easier deployment/management • Unified solution • Simple deployment • Unified dashboard • Rich diagnostics • Centralized management of client connection topology • Multi-DB failover N E W T O P O L O G Y A D V A N T A G E

  19. INDIA │ 28-30 September2011 virtual techdays SQL Server AlwaysOn – BoS(Backup on Secondary)

  20. INDIA │ 28-30 September2011 virtual techdays • Backups are only allowed on Primary • Secondary cannot be leveraged for backups • Backup Workload impacts production Server Database Mirroring Backups

  21. INDIA │ 28-30 September2011 virtual techdays • Backups are allowed on any replica. • Synchronous or asynchronous secondaries • Primary backups still work • Backup workload does not impact production server. • Highly requested feature. • Log backups done on all replicas form a single log chain • Recovery Advisor makes restores simple Active Secondary: Offloading Backup

  22. INDIA │ 28-30 September2011 virtual techdays • Differential backups are not supported on secondary • Only Copy-only full backups are supported on secondary • The only distinction is the differential bitmap clearing • Advisable for backups to be stored centrally Restrictions, cautions, and gotchas

  23. INDIA │ 28-30 September2011 virtual techdays Backup on Secondary & Use them to create new Replica Demo - Backup on Secondary

  24. INDIA │ 28-30 September2011 virtual techdays SQL Server AlwaysOn – Readable Secondary

  25. Reports INDIA │ 28-30 September2011 virtual techdays SQLServr.exe SQLServr.exe Primary Secondary Readable Secondary InstanceA Database Log Synchronization InstanceB DB1 DB2 DB1 DB2

  26. INDIA │ 28-30 September2011 virtual techdays Readable Secondary Data Latency Replica Primary DB1 DB1 Log Recieve Log Capture Network Log Pool Log Cache Redo Thread Commit Log Cache Redo Pages Log Harden Log Flush Page Updated DB1 Data DB1 Log DB1 Log DB1 Data Acknowledge Commit

  27. INDIA │ 28-30 September2011 virtual techdays Reading Data From Secondary & Creating Secondary Routing Demo – Readable Secondary

  28. Reports INDIA │ 28-30 September2011 virtual techdays A F i n a l T o p o l o g y A A A Backups Synchronous Data Movement Asynchcronous Data Movement

  29. INDIA │ 28-30 September2011 virtual techdays • SQL Server AlwaysOn is a comprehensive high availability solution • Better application availability, • Higher return on investment and • Simplified deployment and management • AlwaysOnAvailability Group provide flexibility in HA configuration S U M M A R Y

  30. INDIA │ 28-30 September2011 virtual techdays • Monitoring Performance in Cloud for SQL Azure Applications • Vinod Kumar • 3:00pm - 4:00pm • Managing SQL Server Made Easy - Features and Concepts • Amit Banerjee • 4:15pm - 5:15pm RELATED CONTENT in VTD Sep 29th 2011 – DBA Track

  31. THANKS│28-30 September2011 virtual techdays Please do give your Feedback, Complete evaluation at the end of this session. You could also write to be at : blakhani@microsoft.com│ http://twitter.com/blakhani

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