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Disaster Recovery / Strategies

Disaster Recovery / Strategies. Acknowledgements to Euan Wilson (Staffordshire University). What is a Disaster ?. Very similar question to How long is a piece of string ? . Dictionary Definitions. “an occurrence that causes great distress or destruction”

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Disaster Recovery / Strategies

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  1. Disaster Recovery / Strategies Acknowledgements to Euan Wilson (Staffordshire University)

  2. What is a Disaster ? • Very similar question to • How long is a piece of string ?

  3. Dictionary Definitions • “an occurrence that causes great distress or destruction” • “a thing, project etc. that fails or has been ruined”

  4. “causes great distress or destruction” • Has an effect on business functions and the way business operates • Could define it as a loss of business functionality (or partial loss) for a period of time • But still doesn’t define what a disaster is

  5. Problems of defining a disaster • For example • DIY store has a UK network • enabling all stores to view other stores stock • they can reserve / order stock for their customers from other stores stock • enabling them to hold less stock at each store

  6. Stoke Stone Stafford Hub Newport Derby Telford

  7. So what is a Disaster ? Example One • The Stafford site has a problem and is no longer connected to the other sites • Therefore it’s a disaster for Stafford • but it is a disaster for the organisation ? • The company has lost 1/6 of a particular business function • so is it an annoyance rather than a disaster ?

  8. But is might be a disaster if business is lost • or the fault persists for a period of time • what fall back methods are available • use of the phone / fax • pen and paper • will these overcome the “disaster” ? • If so, its not a disaster

  9. Systems that need to be in place • Network • need to have in place a recovery strategy that gets the network up and functional within an acceptable time period ? • So what is that time period • 30 minutes, 4 hours, 1 day …… • have to analyse cost of down time

  10. Telephone • Possible the most important • Nice easy one ! • Have a contract with a mobile telephone company to provide instant “mobile lines” • Second contract with “land line” company to provide land lines within 24 hours • or something else!

  11. Buildings ? • If they are destroyed what happens • New premises • Portable cabins • Rented • Work from “home”

  12. Hardware • Needs to up and running before network ? • In-house or bought-in support ? • Depends on allowable downtime • Software • Same as for hardware • Example • Oracle DBA at Brussels Airport is allowed to have a non-functional database for 30 minutes each year

  13. Example two • CREST • Bank of England Electronic Share Settlement System • System that allows permitted stock brokers to deal with share on-line • UK wide network • FTSE companies and more

  14. Each member of CREST has to response to a share dealing with 2 hours of the start of the function. • So what would be a disaster ? • A loss of the system for more than 1 hour ? • Recovery • A second identical system

  15. Expensive • Too expensive, but perhaps necessary • It was actually mandatory • But needed • the fines for not completing the transactions is • barring from the system • loss of image • loss of business • loss of reputation

  16. Example three • Same network layout as for first example • but • System for dealing with Police cells • Systems needs to check for • Outstanding warrants • Bail conditions • Other Forces requirements • etc. etc.

  17. Timeliness? • When the person is processed the Duty Officer needs to be aware of all possible data available. • Each area keeps “their own data” I.e. Stafford records data about Stafford residents etc.

  18. Stone link fails • Disaster ? • Duty Officer is not left with a complete picture • Fall back plans ? • Use of telephone / fax etc. ? • System needs to have in-built redundancy

  19. Creating a Disaster recovery Strategy • Stage one • Define organisations view of a disaster • maybe one line • “loss of business functions for more than …” (a time period) • maybe series of scenarios

  20. Stage two • Define disaster scenarios • Fire, flood, acts of God, …. • Bomb, sabotage, …. • Loss of power etc. etc. • Plane crash • Loss of network, telephone system • Define all possible solutions

  21. Stage 3 • Recommend solutions • Fire • New premises • Portable cabins • Shutdown period • etc.

  22. Stage 4 • Implement • All will have • Cost • Contract • and review • Conditions and reliance's change

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