1. SQL Server on Linux: High Availability And Disaster Recovery
12/4/ :25 PM
SQL Server on Linux: High Availability And Disaster Recovery
Joey D’Antoni
Principal Consultant Denny Cherry and Associates Consulting
© Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

2. High Availability and Disaster Recovery
Pacemaker
Failover Cluster Instances
Availability Groups
Log Shipping

3. Mission critical performance HA/DR on Windows and Linux
AlwaysOn cross-platform availability groups
Availability Groups and Failover Clustering now also work with third party clustering technologies like Pacemaker
Availability Groups can now span Windows and Linux or be Linux- only
Enables Testing
Enables Migrations
Cross-Operating System
Sync/Async Replicas
Linux
High Availability
Offload Backups
Scale BI Reporting
High availability
Primary
Sync/Async Replicas
Windows

4. Pacemaker
Pacemaker is a scale High-Availability cluster resource manager
Used in conjunction with Corosync Cluster Engine
Similar in concept to Windows Server Failover Cluster
Corosync manages quorum

5. SQL Server Failover Cluster Instances
Designed for local high availability and geo-availability with storage replicas
Conceptually similar to SQL Server FCI on Windows, implementation is quite different

6. SQL Server Failover Cluster Instances
When to use?
When you need local high availability
When you are running on physical hardware with a SAN
When you only want to manage one SQL Server instance

7. Shared Storage Configuration
Requires NFS
NFS Version 4
NFS-Utils must be installed on each node
SMB is also supported

8. SQL Server Failover Cluster Instances
Demo

9. AlwaysOn Availability Groups
When to use?
Scale out reading scenarios
Virtualized platforms (Azure) where shared storage is a challenge
Multi-site disaster recovery scenarios
Can also be used for local high availability

10. AlwaysOn Availability Groups
Also relies on Pacemaker clustering
CLUSTER_TYPE=EXTERNAL
Optional to run without cluster

11. Availability Group Creation Process
Enable Availability Groups
Enable AlwaysOn_Health Event
Create user for endpoint
Create a certificate
Repeat steps 3-4 on all nodes
Create the Availability Group
Add databases on to Availability Groups

12. Log Shipping
Log shipping will work as long as databases have transaction logs (forever)
SQL Server on Linux doesn’t support GUI based log shipping currently
It is very easy to create your own set of log shipping scripts
Easily works across Linux and Windows with minimal complexity

13. Summary
HA and DR are the biggest differences between SQL Server on Windows and Linux
There are challenges and the process is still maturing
It will get better over time

14. 12/4/ :25 PM
© Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.