In a world of large companies with global operations, operating continuously and business continuity becomes increasingly critical, making a disaster recovery plan becomes more necessary. In the ideal disaster recovery will be be completely automatic, absolutely no loss of data, cost nothing and immediately occur with no effect on the business operations. It would, in fact, be invisible to the customers. It is not possible, it makes sense to get close to ideal as possible.
Accepted both a disaster recovery plan criteria are the target recovery point and recovery time objective.Recovery time objective is the moment where normal commercial must be restored, of course, it wants to be the most short possible.Objectif recovery point is the time for which data must be restored back successfully processing, generally the last point of backup.
Not all data held by a company is essential for the basic operations, but deciding what is and is not critical can itself become a great company and segregation in fact it still more donc.Pour because of this, many companies choose not to adopt this approach and instead reproduce everything they.For companies with a relatively local site for replication and a direct link, it is a very attractive option.
If a regional disaster protection is necessary, requiring the use of a telecommunications link to transfer data, the cost of regular reproduce everything can be extremely high and it may be necessary to prioritize data or use copies less fréquentes.Cela has an impact on the definition of recovery time objective (the amount of data can be transferred?) and recovery point objective (frequency data are transferred?).
Like any other event, disasters have a beginning and an end.The time between is called "rolling disaster."
All disaster recovery solution must provide an image or copy data, as it existed prior to the disaster, location secondaire.alors than any image or copy of the data at any time before the disaster can be regarded as reliable, the reliability of all copies made for rolling disaster cannot be guaranteed.It is unlikely to be a problem for a short time rolling disaster, but it's disaster étendue.Il is becomes particularly relevant if a solution in which the data is copied permanently, continuous availability, disaster recovery is being employed.
Directly between the primary and alternate sites via ESCON, repeaters, sets a limit of most modern geographic 43 km of dark fibre separation and dense wave division Multiplexer (DWDM) technology, sites can be directly linked up to 90 km distance .c ' is enough to connect two datacenters Metro and gives a greater disaster protection while allowing bandwidths higher that offers this technology.
If there is a requirement for protection of a regional disaster, separating the primary sites and replacing it with a greater than 90 km, distance the sole means of replication data is on télécommunications.Comme lines distance, bandwidth requirements and the amount of data increases, this can become a very expensive choice.
Andrew Whitehead is a contributor to the free - backup .info - the home of the best tool backup online - Back2zip before article found at http://free-backup.info/overview-of-disaster-recovery.html
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