High Availability Technologies for Db2 LUW
What is High Availability?
High availability (HA) ensures that critical applications and services remain accessible and operational with minimal downtime, even during hardware or software failures.
By implementing High Availability solutions, businesses can maintain service continuity, protect data integrity, and provide a seamless experience to their users, thereby avoiding the costly consequences of downtime.
Organisations are increasingly operating on a global scale. High availability is crucial for organisations that rely on continuous access to their systems and data. This is particularly important for sectors such as finance, healthcare, e-commerce, and telecommunications, where any interruption in service can result in significant financial losses, reputational damage, and regulatory penalties.
DB2 features that minimise unplanned outages:
pureScale and HADR
Can be used to implement disaster recovery of pureScale clusters over long distance. Together, Db2 pureScale and HADR reduce the risks of planned and unplanned outages to help meet your SLA requirements.
Db2 pureScale
Db2’s clustering solution designed for organisations that require high and continuous availability, reliability and scalability for online transaction processing (OLTP) to meet stringent service level agreements.
HADR
HADR is a database replication feature that provides a high availability solution for both partial and complete site failures. HADR protects against data loss by replicating data changes from a source database to a target standby database in real-time. With HADR, the standby database can take over in seconds in the event of a failure on the source database.
Pacemaker
Pacemaker is an open-source, high availability cluster manager software integrated with Db2 Advanced Edition and Db2 Standard Edition on Linux. It is designed to provide disaster recovery and high availability capabilities for on-premises deployments and non-container cloud environments like Amazon Web Services (AWS).
Replication
SQL or Q-replication can be very useful for setting up a high availability failover database that can be also be used for test or reporting purposes.
Automatic Client Reroute
Can be used with HADR to automatically redirect the clients to the standby database in the event of a failure on the source database thereby minimising application downtime.
Resources
Configuring Db2 Pacemaker HADR cluster with QDevice in AWS
Damir Wilder demonstrates how a Db2 Pacemaker/HADR cluster with a QDevice can be deployed on RHEL9 virtual servers in the AWS VPC environment.
DB2 HADR Automation with Pacemaker
In his latest ebook Damir Wilder shares his experiences on working with Pacemaker
Db2 pureScale
Clustering technology that delivers continuous availability, unlimited scalability and application transparency.
ZMARS
The Z Mainframe Availability and Resiliency Service (ZMARS) comprises of various modules designed to enhance your Db2 server’s resilience, continuous application service availability, recovery speed, and system performance.
Disaster Recovery
The ZMARS Disaster Recovery module evaluates and enhances your disaster recovery capabilities to ensure your organisation can respond effectively and promptly to major outages during which you can no longer conduct business from your primary production site.