CAJ | 학술논문

为了克服现有信息系统生存性恢复手段单一、执行顺序固化以及恢复过程缓慢等不足,提出了一种以功能部件作为基本修复单位的生存性恢复机制.该机制根据关键功能部件的失效程度将信息系统提供的服务区分成完整服务、可接受服务以及中断服务3种类型,并以功能部件的可用性定义服务和信息系统的生存性.根据失效功能部件对服务的影响程度将恢复过程分为2个阶段,先通过修复关键功能部件恢复中断服务,然后再通过修复非关键功能部件完善可接受服务.应用新的恢复机制对一个网络教学系统进行生存性恢复实验,结果表明该机制能够依据信息系统的生存性态势确定恢复行为和执行顺序,与串行恢复机制相比,恢复行为的执行次数由9减少到3.
위료극복현유신식계통생존성회복수단단일、집행순서고화이급회복과정완만등불족,제출료일충이공능부건작위기본수복단위적생존성회복궤제.해궤제근거관건공능부건적실효정도장신식계통제공적복무구분성완정복무、가접수복무이급중단복무3충류형,병이공능부건적가용성정의복무화신식계통적생존성.근거실효공능부건대복무적영향정도장회복과정분위2개계단,선통과수복관건공능부건회복중단복무,연후재통과수복비관건공능부건완선가접수복무.응용신적회복궤제대일개망락교학계통진행생존성회복실험,결과표명해궤제능구의거신식계통적생존성태세학정회복행위화집행순서,여천행회복궤제상비,회복행위적집행차수유9감소도3.
A recovery mechanism of survivability with components being basic fixed units is presented for information systems to overcome the deficiencies appeared in existing approaches on survivability recovery, such as undiversified method, solidified executing sequence and delayed recovery process. Services provided by a information system are classified into complete services, acceptable services and interrupted services according to the disabled extent of critical components, and the survivability models of services and the information system are built separately with availability of components. According to the affecting degree of disabled components on services, the recovery procedure is divided into two phases, recovering interrupted services by repairing critical components and improving acceptable services by repairing non-critical components. A survivability recovery experiment in a network teaching system shows that the proposed mechanism can determine the recovering actions and executing sequences depending on the survivability state of information systems. A comparison with the mechanism using serial recovery actions shows that the number of actions performed by the proposed mechanism is reduced from 9 to 3.