Highly Available SQL Deployments in the Cloud - What You Need to Know

Transcription

1 Highly Available SQL Deployments in the Cloud - What You Need to Know Moving business critical applications, such as Microsoft SQL Server, to virtual server and cloud environments, requires high availability and a solid disaster protection plan. Clusters Your Way.

2 Who is Dave Bermingham? Author ClusteringForMereMortals.com MSDN Press Blog Microsoft Cloud and Datacenter MVP 2010-Present Multisite Clusters, Azure, SQL Server SIOS Technology Senior Technical Evangelist Focused on High Availability and Disaster Recovery since 2004 Contact 2

3 Business Critical Workloads Moving Rapidly to The New Data Center Traditional Data Center Physical The New Data Center Physical Virtual Cloud IT Flexibility & Agility Private Cloud Public Cloud Hybrid Cloud

4 Critical applications are moving to the cloud Gartner predicts that the bulk of new IT spending by 2016 will be for cloud computing platforms and applications and that nearly half of large enterprises will have cloud deployments by the end of High availability and disaster protection in cloud environments is a critical need. Source: Gartner Newsroom 4

5 Myth #1: Clouds are HA environments The myth: Public cloud deployments are automatically high availability environments where application downtime is negligible. The truth: Clouds are not high availability environments unless you add HA protection. The average unavailability of cloud services is 10 hours per year or more, while the average availability is estimated to be 99.9% (9 hours or more than a day of downtime), far less than the expected availability of business critical applications. Josh Whittaker, ZDNet 5

6 Cloud Downtime in

7 Outages as reported via Twitter 7

8 Cloud SLA 99.95% Guaranteed 8

9 But wait did you want storage with that VM? 9

10 Redundancy is not enough. Web and application services in different geographic locations in the cloud Microsoft SQL Server cannot be made redundant with a simple load balancer and multiple instances in different Fault Domains What about the Data Tier? Fault Domain Fault Domain Databases such as SQL Server need additional configuration Load balancers in front of Web or Application servers

11 What can you do? Update Domain Azure Virtual Network Update Domain Transactional applications such as SQL, Oracle, MySQL, SAP, etc. require additional configuration WEB1 SQL1 Replication WEB2 SQL2 Some applications can simply be load balanced across multiple Availability Zones/Fault Domains. Load Balancer 11

12 The Enabling Technology 12

13 #SANLess Cluster vs. Availability Groups AlwaysOn Availability Groups #SANLess Cluster Support SQL Standard Edition 0 4 Distributed Transactions 0 4 Unlimited Databases 0 4 Protects System Databases (Master, MSDB, etc) 0 4 Eases Database Administration 0 4 Support more than 2-nodes in failover configuration 0 4 Replicates Data other than SQL 0 4 Readable Secondary 4 0

14 Myth #2: You can t have failover cluster protection in a cloud The myth: You cannot protect business critical applications in a public or private cloud by using a cluster. The truth. Traditional HA in a physical deployment is with a failover cluster using a shared storage (SAN). Public clouds (ie, Amazon EC2, Azure) have no concept of a cluster-aware shared storage. You can create a SANLess cluster for HA and DR protection in a cloud environment. 14

15 High Availability Clusters in Cloud Environments Traditional failover clustering requires shared storage FAILOVER But shared storage is not available in public clouds or practical in private clouds SQL SERVER storage REPLICATION SQL SERVER SQL SERVER storage SANLess clusters provide synchronized redundant storage for cloud environments without SAN storage SANLess cluster software presents cloud storage to WSFC as a SAN 15

16 Why Do Customers Like Failover Clustering? It comes with Windows Server Familiar to Windows IT Admins Easy to Create a Failover Cluster No Additional Training or Specialized Skills Compatible with SQL Server and other Windows Applications 16

17 Myth #3: HA in a cloud is costly and complicated The myth: Creating an HA environment in a cloud requires complex scripting, specialized skills, or added complexity. The truth: A SANless HA cluster in a cloud takes can be built in minutes without specialized skills. Use Standard Edition instead of costly Enterprise Edition of SQL Failover Clustering comes included with Windows Server 2012/2012R2 Cluster Validation Wizard eliminates the need for the Hardware Compatibility List Azure Resource Manager Deployment Templates 17

18 What About Failure of Entire Regions? Update Domain Azure East Update Domain High SQL Server Failover Cluster Instance Availability Azure West Locally Update Domain SQL1 Replication SQL2 SQL3 Web Application Web Application In the event an entire region fails you will need a way to rapidly recover with minimal data loss 18

19 What About Failure of The Cloud? Virtual Private Network Azure East SQL Server Failover Cluster Instance Menlo Park Data Center Fault Domain Fault Domain SQL1 Web Application Replication SQL2 19 Web Application SQL3 In the event of a Cloud Wide outage you will need a way to recover quickly with minimal data loss 19

20 What About Failure of The Cloud Virtual Private Network Azure West Hybrid Cloud Multisite Cluster Amazon West Fault Domain Fault Domain SQL1 Replication SQL2 SQL3 You may consider spanning multiple cloud providers 20 20

21 Questions? Blog ClusteringForMereMortals.com 21

22 Thank you! Dave Bermingham 22