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High Availability Options for DB2 Data Centre
1.
© 2015 IBM
Corporation High Availability Options for DB2 Data Centre Zoran Kulina IBM Global Services
2.
© 2015 IBM
Corporation2 Table of contents 1. What is High Availability? 2. PowerHA SystemMirror 3. DB2 HADR feature 4. InfoSphere Data Replication 5. Conclusion High Availability Options for DB2 Data Centre
3.
© 2015 IBM
Corporation3 What is High Availability? Availability Degree to which a database is available to users. Top priority for mission critical systems (e.g., air traffic control). Ideally close to 100% for critical databases or tables. Unavailability results in lost revenue, shaken customer loyalty and damaged reputation. High Availability Options for DB2 Data Centre Source: http://www.evolven.com/blog/downtime-outages-and-failures-understanding-their-true-costs.html
4.
© 2015 IBM
Corporation4 What is High Availability? High Availability Set of components and procedures for ensuring that a database system remains operational and accessible during planned or unplanned outages. Real-time database monitoring and failure detection. Fast and automated recovery. Transparent to end users. Not a specific technology. Not a quantifiable attribute. Not a synonym for uptime. High Availability Options for DB2 Data Centre
5.
© 2015 IBM
Corporation5 What is High Availability? Characteristics of a High Availability solution Incorporates redundancy across most or all components. Protects from hardware and software failures, human errors, data corruptions and site disasters. Delivers near zero downtime from availability perspective. Detects errors and outages in timely fashion. Recovers from outages as quickly as possible. Facilitates transparent recovery and workload swap. Provides a reliable failover mechanism. Eliminates or minimizes planned downtime. Offers consistent performance on each node. High Availability Options for DB2 Data Centre
6.
© 2015 IBM
Corporation6 PowerHA SystemMirror Characteristics Failover clustering methodology Separate hardware and software Shared instance and database storage Advantages Proven technology Cost effective Disadvantages Database a single point of failure Requires specialized storage Increased administrative overhead Servers must be in close physical proximity (SAN latency) High Availability Options for DB2 Data Centre Source: High Availability and Disaster Recovery Options for DB2 for LUW (IBM Redbook SG24-7363-02)
7.
© 2015 IBM
Corporation7 DB2 HADR feature Characteristics Log shipping methodology Continuous “backup and restore” Separate instances and databases Advantages No single point of failure Extremely fast takeover Easy to implement and maintain Disadvantages No built-in automatic takeover Uses more hardware resources Some potential for data inconsistency High Availability Options for DB2 Data Centre Source: http://www.ibm.com/developerworks/data/library/long/dm-1206hadrmultiplestandby
8.
© 2015 IBM
Corporation8 InfoSphere Data Replication Characteristics SQL replication methodology Transactions re-executed at remote site Covers all or subset of tables Advantages No single point of failure Extremely fast failover Used for purposes other than HA Disadvantages Uses more hardware resources Complex configuration and maintenance More ways for things to go wrong than in other solutions High Availability Options for DB2 Data Centre Source: http://www.ibm.com/developerworks/library/bd-infosphere-datarep/index.html
9.
© 2015 IBM
Corporation9 Conclusion No one size fits all solution: – PowerHA focused on hardware redundancy. – HADR database disaster recovery oriented. – Replication primarily concerned with data streaming. Determine how to mitigate the drawbacks of each solution. Combine multiple solutions for a better risk coverage. Mind the law of diminishing returns: – Too much complexity introduces more failure points. Test thoroughly and often. High Availability Options for DB2 Data Centre
10.
© 2015 IBM
Corporation10 References Improving Systems Availability (IBM Global Services whitepaper) http://www.dis.uniroma1.it/irl/docs/availabilitytutorial.pdf High Availability and Disaster Recovery Options for DB2 for Linux, UNIX, and Windows (IBM Redbook) http://www.redbooks.ibm.com/abstracts/sg247363.html Downtime, Outages and Failures - Understanding Their True Costs http://www.evolven.com/blog/downtime-outages-and-failures-understanding-their-true- costs.html High Availability Options for DB2 Data Centre
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