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Messaging: Zero Downtime Communications


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Messaging plays a crucial role in the day to day operations of most businesses. Millions of emails are sent around the world every second containing customer orders, confidential data and information critical to its recipients. But what happens when your email system goes down?
Waterstons’ messaging specialists, Andrew Quinn and Nigel Robson, discuss the importance of a bulletproof messaging service to support your organisation’s communications.
How do we protect ourselves against different types of failures, and how can we continue to provide effective services in a worst case scenario?

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Messaging: Zero Downtime Communications

  1. 1. Messaging: Zero Downtime Communications Andrew Quinn & Nigel Robson 11/10/2013
  2. 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
  3. 3. 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
  4. 4. High Availability Service Continuity Disaster Recovery Site Resilience !
  5. 5. High Availability • Eliminate single points of failure • Automatic recovery in the event of a failure • Little or no loss of service
  6. 6. Single Points of Failure
  7. 7. High Availability Options • • • • Clustering Replication Network Load Balancing DNS Round Robin
  8. 8. Disaster Recovery • Outage has occurred • Restore services as quickly as possible • Human intervention required
  9. 9. Disaster Recovery Options • Backups – Traditional / Virtual Machine – Tape / Disk • Replication – Application level – Storage level – Virtual Machine level
  10. 10. 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?
  11. 11. 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?
  12. 12. Evolution of Exchange Recoverability: 2003 • Multiple servers using shared storage • Automatic recovery from server failure • No protection against storage failure • No offsite recovery
  13. 13. 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
  14. 14. 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
  15. 15. 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
  16. 16. 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
  17. 17. Modern Site Resilience Datacentre 1 Witness Site Datacentre 2 Exchange 2013 Server File Share Witness Exchange 2013 Server Office Workers, Home Workers, Remote Workers
  18. 18. 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
  19. 19. Service Continuity Continuity Provider Internet Continuity Mailbox Message Queue Webmail Outlook Mail Server
  20. 20. 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
  21. 21. Q&A Coming up… Messaging: Protecting your Data and your Reputation 1st November 2013 Messaging: Harnessing the Cloud 15th November 2013