容灾的目的是什么

A flood disaster took place in some areas in China It had been raining all those days and never stopped, which led to the flood The PLA men arrived immediately to rescue the villagers of the flooded areas And they did their best to fight against the flood They supplied the villagers with fresh vegetables and food Some medical teams were organized to help them so that they could have healthy diet Poisonous food and dead animals were not allowed to be eaten and the water must be cleared over and over again before being drunk The doctors told them to pay special attention to their health Some leaders of our country also inspected the areas Supplies and money from all parts of our country were sent to those areas to support them After a long time, everything went on very well And that was a sign of victory

洪灾

中国一些地区由于连日降雨，导致了洪灾。多亏解放军及时赶-到营救灾民。他们在抗洪中竭尽全力，给村民们供应了新鲜蔬菜和食品。一些临时组建的医疗队确保村民们能吃上卫生安全的食物。为了确保安全，有毒的食品和死亡的动物是禁止食用的，水在饮用之前也必须经过数次净化。医生们告诉灾民如何特别注意健康问题。国家***也视察灾区。全国各地的赈灾物资都被运往灾区救济灾民。一段时间后，灾区的一切都进展顺利，这预示着抗洪救灾取得了胜利。

Natural Disasters-自然灾害 In the past hundred years, there have heen frequent natural disasters, such as floods, droughts, mud-rock flows, sei ic sea waves, earthquakes, windstorms and the stretching of new deserts The disasters have killed millions upon millions of people, destroyed countless homes, and wiped out numerous pieces of fertile land Now more and more people bee aware that those disasters have much to do with what we have done to the earth We have cut down too many trees in the forests,we have badly polluted the environment, we have shocked our own home-pla time and again with tremendously powerful explosions of nuclear bombs As a result, climates have bee abnormal, rainwater rushes down hillsides angrily, and the underground energy goes up to revenge itself on us The earth is our only home-pla It is urgent for us to stop damaging it, and to do our best to protect it and make it a lovely place suitable to live in, for we have nowhere to go and survive except where we are now 突然、是不可预测的。自然灾害通常是剧烈的，其破坏力极大。持续时间有长有短。灾难包括了很多因素，它们会引起受伤和死亡，巨大的财产损失以及相当程度的混乱。一次灾难事件持续时间越长，受害者受到的威胁就越大，事件的影响也就越大。另一个影响灾难程度的主要特征，是人们是否获得了足够的预警。 Suddenly, is unpredictable Natural disasters is usually fierce, with great destructive power The duration of a long short Disaster, including a lot of factors that would cause injuries and deaths, huge property losses and a considerable degree of confusion A disaster and the longer the duration of the incident, the victims are the greater the threat, the greater the impact of the incident Another impact of the disaster extent of the main features is that people are getting the adequate warning naturaldisasters inthepasthundredyears,therehaveheenfrequentnaturaldisasters,suchasfloods,droughts,mud-rockflows,sei icseawaves,earthquakes,windstormsandthestretchingofnewdesertsthedisastershavekilledmillionsuponmillionsofpeople,destroyedcountlesshomes,andwipedoutnumerouspiecesoffertileland nowmoreandmorepeoplebeeawarethatthosedisastershavemuchtodowithwhaehavedootheearthwehavecutdowntoomanytreesintheforests,wehavebadlypollutedtheenvironment,wehaveshockedourownhome-platimeandagainwithtremendouslypowerfulexplosionsofnuclearbombsasaresult,climateshavebeeabnormal,rainwaterrushesdownhillsidesangrily,andtheundergroundenergygoesuptorevengeitselfonus theearthisouronlyhome-plaitisurgentforustostopdamagingit,andtodoourbesttoprotectitandmakeitalovelyplacesuitabletolivein,forwehavenowheretogoandsurviveexcepherewearenow a flood Do you know floods They are the No1 natural killer When a flood occurred , hourses were washed away , roads and villages were destoryed , crops were damaged and people were killed It also caused huge economic damage After a flood , many people donated money , food , clothes and so on through the Red Cross to send to the flooded areas Floods are very the stuctive and horrible So we need plant more trees to provent floods

保持对信息系统的业务持续性。

容灾系统是指在相隔较远的异地，建立两套或多套功能相同的IT系统，互相之间可以进行健康状态监视和功能切换，当一处系统因意外（如火灾、地震等）停止工作时，整个应用系统可以切换到另一处，使得该系统功能可以继续正常工作。

容灾技术是系统的高可用性技术的一个组成部分，容灾系统更加强调处理外界环境对系统的影响，特别是灾难性事件对整个IT节点的影响，提供节点级别的系统恢复功能。

从其对系统的保护程度来分，可以将容灾系统分为:

数据级容灾是指通过建立异地容灾中心，做数据的远程备份，在灾难发生之后要确保原有的数据不会丢失或者遭到破坏，但在数据级容灾这个级别，发生灾难时应用是会中断的。

在数据级容灾方式下，所建立的异地容灾中心可以简单地把它理解成一个远程的数据备份中心。数据级容灾的恢复时间比较长，但是相比其他容灾级别来讲它的费用比较低，而且构建实施也相对简单。

应用级容灾是在数据级容灾的基础之上，在备份站点同样构建一套相同的应用系统，通过同步或异步复制技术，这样可以保证关键应用在允许的时间范围内恢复运行，尽可能减少灾难带来的损失，让用户基本感受不到灾难的发生，这样就使系统所提供的服务是完整的、可靠的和安全的。

应用级容灾生产中心和异地灾备中心之间的数据传输是采用异类的广域网传输方式；同时应用级容灾系统需要通过更多的软件来实现，可以使多种应用在灾难发生时可以进行快速切换，确保业务的连续性。

业务级容灾是全业务的灾备，除了必要的IT相关技术，还要求具备全部的基础设施。其大部分内容是非IT系统（如电话、办公地点等），当大灾难发生后，原有的办公场所都会受到破坏，除了数据和应用的恢复，更需要一个备份的工作场所能够正常的开展业务。

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