Vineet Rao Lead Program Manager Microsoft Corporation SESSION CODE: DAT207

Analysis Solution Design Implementation Testing Maintenance Deployments and Best Practices Ensuring IT services and operational continuity in the enterprise Protect mission critical SQL Server databases using Always On Technologies Ensuring IT services and operational continuity in the enterprise Protect mission critical SQL Server databases using Always On Technologies

Availability Class Acceptable Downtime (hrs/yr) OR RTO Acceptable Data Loss (time of last copy) OR RPO Tier 1 >99.99% (1 hr or less) 5 min or less Tier % % ( hrs)5 mins to 8.5 hrs Tier 3 (<99.9%) (Hours to days) Hours to days

Local HA Regional DR Geographic DR  Protection against  Network Outages  Site Failures  Location Redundancy – City, County – < 100  Protection against  Natural Disasters  Location Redundancy – State, Country – > 100 miles

Mirror Principal Witness Log Application SQL Server Data Log 3 3 >2 >3 Mirror is always redoing—it remains current Commit

New Jersey Transactional Replication Reporting + Redundancy Peer to Peer Replication Query Scale Out + Redundancy New York Boston Seattle Tokyo Shanghai England

1.Backup principal log with norecovery 2.Recover secondary 3.Re-direct clients to secondary Optional: switch roles again

No Data Loss (RPO=0) Failover UnitAuto Failover (RTO) InstDBTab + ** ReadMult- iple Write * * * Solutions Log Shipping DBMSync Async Cluster Transactional Replication Peer-Peer Replication RPOFailover Redundancy and Utilization Hard-ware App Perf Impact Manag- eability Low HighLow High***Low *** Low High Low High Cost * Database Mirroring and Log Shipping can provide point in time read capability using STANDBY or database snapshots respectively ** Database Mirroring provides fastest failover to hot secondary *** Depends on SAN technology

Adventureworks Inc is a manufacturing company that manufactures and sells bicycles across the world. There are a number of applications, some that are mission critical that run on multiple SQL Server Instances The DBA team is run by Darren who is responsible for deploying and managing the application databases. One of his core responsibilities is to ensure availability of all application databases in order to meet the application SLA AdventureWorks Inc Scenario

Data Loss RPO=0 RTO in secs Failover UnitAuto Failover InstDBTab ReadMultiple Sites Read Write Applications Manufacturing Finance Scheduling Application Requirements

Clustering can provide a zero data loss solution that can also provide fast instance level failover Use RAID configuration to provide data redundancy on the SAN If a redundant copy is required that can provide instance failover with zero data loss use SAN replication High Cost Solution Use synchronous database mirroring if instance failover is not needed SolutionsData Loss RPO=0 Fast RTO Failover UnitAuto Failover Read> 1 Sites\ Copy Read Write InstDBTab Cluster SAN Replication DBM - Sync  Log Shipping Transactional Replication Peer-Peer Replication Clustering with RAID DBM - Async  Solution Choice for Manufacturing Application

 For database level redundancy with acceptable data loss with minimal perf impact, asynchronous database mirroring is an optimal choice  Use database snapshots at periodic intervals to provide a readable snapshot of the data for reporting  Low cost solution DBM - Async  Cluster SolutionsData Loss RPO=0 Fast RTO Failover UnitAuto Failover Read> 1 Sites\ Copy Read Write InstDBTab SAN Replication Log Shipping Transactional Replication Peer-Peer Replication Async Database Mirroring Omaha Datacenter Finance Db Snapshot every hour Reports Scheduling DBM - Sync  Solution Choice for Finance Application

Adding a regional datacenter into the mix

Async Database Mirroring Omaha Datacenter Finance Db Snapshot every hour Reports Scheduling Sync Mirroring no witness Log Shipping CB Datacenter Cluster with SAN Manufacturing Regional Site Solution Choices

Complete Architecture

Sync Mirroring No witness Cluster with SAN Log Shipping Manufacturing Topology Diagram

Licensing Facts

HA Features Edition Support FeatureExpressWorkgroupStandardEnterpriseComments Database Mirroring 1 Advanced high availability solution that includes fast failover and automatic client redirection Failover Clustering 2 Backup Log-shipping Data backup and recovery solution Online System Changes Includes Hot Add Memory, dedicated administrative connection, and other online operations Online Indexing Online Restore Fast Recovery Database available when undo operations begin ₁Single thread redo ₂ Limited to 2 node cluster

Summary

DAT401 | High Availability and Disaster Recovery: Best Practices for Customer Deployments DAT305 | See the Largest Mission Critical Deployment of Microsoft SQL Server around the World DAT303 | Architecting and Using Microsoft SQL Server Availability Technologies in a Virtualized World DAT407 | Windows Server 2008 R2 and Microsoft SQL Server 2008: Failover Clustering Implementations WSV313 | Failover Clustering Deployment Success WSV314 | Failover Clustering Pro Troubleshooting with Windows Server 2008 R2 DAT09-HOL | Installing a Microsoft SQL Server SP1 Clustered Instance DAT12-HOL | Maintaining a Microsoft SQL Server 2008 Failover Cluster VIR06-HOL | Implementing High Availability and Live Migration with Windows Server 2008 R2 Hyper-V

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