推荐回答(2个)
集群和双机热备的区别么,就像交通和火车的区别一样。概念上来说稍微有些不同。
集群系统的概要
现在的计算机社会中,持续的提供不停止的服务已经成为通往成功的关键。例如仅由于 1
台机器故障或超负荷而宕机就导致对客户的服务全面停止。这样的话,不但会带来莫大的
损失,还会失去客户的信任。
随着集群系统的导入,发生意外事故时会将系统停止时间(宕机时间)降低到最小限度、使
负载均衡,提高其可用性。
所谓集群,有“集团”、“团”的意思,顾名思义是“将多个计算机汇集成一群(或者多群),谋求
提升可靠性及处理性能的系统”。集群系统有多个种类,可分为下列3 种。其中,
NEC ExpressCluster 属于High Availability 集群。
HA (High Availability) 集群
是平时作为运行服务器作业,在运行服务器发生故障时将业务交接到待机服务器的集
群。是以高可用性为目的的集群。包括共享磁盘型、镜像磁盘型。
负载均衡集群
是将客户端的请求遵从恰当的负荷均衡原则分配给各节点的集群。是以高扩展性为目
的的集群、一般无法进行数据交接。包括load balance 集群、并列数据库集群。
HPC (High Performance Computing)集群
是指计算量非常大的集群。是为使用超级计算机执行单一业务的集群。使用所有节点
的CPU 来执行单一业务的网格计算技术近年来已成为热点。
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