fbpx

Business Continuity

Business Continuity should be in compliance with the following three points:

  • available on demand and at any time
  • with acceptable performances in response to requests in difficult circumstances
  • with acceptable features in response to requests in difficult circumstances
Computer technologies such as "high availability" solutions allow a system to perform without disruption during a period of time superior to that guaranteed by each of its component. High availability is often achieved through a breakdown tolerance.

The information system architect should:

  • define what availability means in the context of the information system
  • combine the appropriate hardware and software to create a highly available information system


It has been designed to find answers to the following questions:

  • how long should the system be available? At what frequency is it used?
  • what are the consequences if the system is unavailable when it is required?

Read More... Types of breakdown

Types of Breakdown

Les différents types de panne conduisant à une indisponibilité de service sont les suivantes :

  • system crash
  • application crash
  • disk crash
  • disk full
  • network breakdown
  • power outage
  • data center breakdown
  • disaster on the scale of a building
  • major disaster

Read More... Level of availability

Level of Availability

The level of availability can be expressed by the Nine Rule :

Percentage of availability Percentage of unavailability Annual unavailability Weekly unavailability
98% 2% 7.3 days 3 hours, 22 minutes
99% 1% 3.65 days 1 hour, 41 minutes
99.8% 0.2% 7 hours, 13 minutes 20 minutes, 10 secondes
99.9% 0.1% 8 hours, 45 minutes 10 minutes, 5 secondes
99.99% 0.01% 52.5 minutes 1 minute
99.999% 0.001% 5.25 minutes 6 secondes
99,9999% 0,0001% 31,5 seconds 0,6 secondes

The effect of service unavailability time can be more or less important according to the business and the day this happens. In most environments, the transition from a system availability of 99% to 99.9% increases the costs by 5 to 10 times.


Lire la suite... Technologies

Technologies

Current technologies which make it possible to ensure business continuity are as follows:

  • redundancy
  • replication
  • Point-in-Time-copy (Snapshot)
  • clustering
  • virtualization
  • restoration

  • Read More... Redondance