Messaging: Zero Downtime Communications
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The document discusses the importance of high availability, disaster recovery, and service continuity in business communications, especially focusing on email systems. It outlines various strategies and technologies for maintaining service resilience, including clustering, replication, and offsite recovery methods, while highlighting the evolution of Exchange recoverability from 2003 to 2013. The summary concludes that email is critical for business operations and emphasizes the affordability of resilient services for small and medium enterprises.
Messaging: Zero Downtime Communications
- 1. Messaging: Zero Downtime Communications Andrew Quinn & Nigel Robson 11/10/2013
- 2. Email and your Business • Primary method of business communications • Stores critical business data • Outages can result in financial loss • Often don’t realise importance until it’s gone
- 4. Some Definitions • High Availability (HA) – Preventing a service outage in the event of a hardware or software failure • Disaster Recovery (DR) – Restoring services following a major outage • Site Resilience – Quickly recovering from the loss of a site (can be HA or DR) • Service Continuity – Providing basic services during an outage
- 5. High Availability Service Continuity Disaster Recovery Site Resilience !
- 6. High Availability • Eliminate single points of failure • Automatic recovery in the event of a failure • Little or no loss of service
- 7. Single Points of Failure
- 8. High Availability Options • • • • Clustering Replication Network Load Balancing DNS Round Robin
- 9. Disaster Recovery • Outage has occurred • Restore services as quickly as possible • Human intervention required
- 10. Disaster Recovery Options • Backups – Traditional / Virtual Machine – Tape / Disk • Replication – Application level – Storage level – Virtual Machine level
- 11. Disaster Recovery Metrics • Recovery Point Objective – How much data loss will be incurred in the worst case? • Recovery Time Objective – How long will it take to recover services in the worst case?
- 12. Disaster Recovery Considerations • Data consistency – Application consistency – Crash consistency – Additional recovery steps • Rehearsals – Make sure it works! • Access – How will people access the recovered services?
- 13. Evolution of Exchange Recoverability: 2003 • Multiple servers using shared storage • Automatic recovery from server failure • No protection against storage failure • No offsite recovery
- 14. Evolution of Exchange Recoverability: 2007 • More servers required • No shared storage • Automatic recovery from server or storage failure • Offsite replication to a standby server • Offsite recovery takes quite a bit of manual work
- 15. Evolution of Exchange Recoverability: 2010 • Less servers required (if using load balancers) • Automatic recovery from server or storage failure • Offsite replication to a live server • Offsite recovery time significantly reduced
- 16. Evolution of Exchange Recoverability: 2013 • Load balancers optional • Automatic recovery from server or storage failure • Offsite replication to a live server • High availability across sites
- 17. Evolution of Exchange Recoverability: Summary Version Protection from Server Failure Protection Offsite from Storage Disaster Failure Recovery Cross-Site High Availability 2003 Yes No No No 2007 Yes Optional Slow No 2010 Yes Yes Quicker No 2013 Yes Yes Quicker Yes
- 18. Modern Site Resilience Datacentre 1 Witness Site Datacentre 2 Exchange 2013 Server File Share Witness Exchange 2013 Server Office Workers, Home Workers, Remote Workers
- 19. Service Continuity • Maintain incoming / outgoing messaging service in the event of a complete messaging infrastructure failure • Typically implemented using a hosted partner • Often an add-on to hosted messaging hygiene solutions
- 21. Summary • Email has become critical to business operations • Highly resilient services have become affordable to SMEs • You can mix and match options to provide a level of resilience to suit your needs and budget
- 22. Q&A Coming up… Messaging: Protecting your Data and your Reputation 1st November 2013 Messaging: Harnessing the Cloud 15th November 2013
Editor's Notes
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- #4: NigelNotifications, internal emails, external emails to and from clients and suppliers144.8 Billion emails sent per day, 89 billion are business relatedShows mobile device are heavily used, 27% of all emails are opened on a mobile device
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