一.服务器基本知识
从广义上讲,服务器是指网络中能对其他机器提供某些服务的计算机系统。
从狭义上来讲,服务器是网络上一种为客户端计算机提供各种服务的高性能计算机。在网络操作系统的控制下,服务器将与其相连的大容量硬盘,磁带、打印机及名种专用通信设备提供给网络上的客户站点共享。服务器也能为网络用户提供集中计算、信息发布及数据管理等服务。
二.服务器的功能与分类
在信息系统中,服务器主要应用于数据库和 Web 服务,这决定了服务器应该具备更可靠的持续运行能力、更强大的存诸能力和网络通信能力、更快捷的故障恢复功能和更广阔的扩展空间。同时,对数据安全类的应用还要求服务器能够提供数据备份功能。按应用层次划分,服务器可分为入门级服务器、工作组级服务器、部门级服务器和企业级服务器4类,
(1)入门级服务器。这类服务器无论在性能上还是价格上都与一台高性能PC品牌机相差无几,,是最基础的也是最低档的服务器,主要采用 Windows 操作系统,能为 20 台以内的 PC 提供资源共享服务,稳定性,可扩展性以及容错和冗余性能较差,可以满足办公室小型网络用户的文件共享、数据处理、Internet 接入及简单数据库应用的需求。
(2)工作组服务器。工作组服务器配置优于入门级服务器,能为一个工作组(约 50台PC)用户提供资源共享服务。工作组服务器通常仅支持单或双CPU(32 位)结构的应用服务器,采用32 位的CPU和 Windows 服务器操作系统。可以满足中小型网络的数据外理,文件共享,Internet 接入及小规模的数据库应用。工作组服务器性能有所提高,有一定的可扩展性,但容错和冗余性能仍不完善,不能满足数据安全、可靠与稳定系统的应用。
(3)部门级服务器,部门级服务器配置高于工作组服务器。一般支持双 CPU(32 位)的对称处理器结构,配置较高的数据总线芯片组、较大内存和较大磁盘容量,还集成了运行监测及管理设施,可通过控制面板,使管理人员及时了解服务器的工作状况。同时,部门级服务器具有优良的系统扩展性,能够满足用户在、务量讯速增大时及时在线升级系统。部门级服务器采用 32位或64位的Linux 或 Windows 服务器操作系统。部门级服务器能够为200 个左右的 PC用户提供资源共享服务,适用于对处理速度和系统可靠性要求较高的中小型企业网络。
(4)企业级服务器。企业级服务器配置高于部门级服务器。一般支持4个(或8个)64 位 CPU 的对称处理器结构。配置较高的数据总线芯片组,具有高内存带宽,大容量热插拔硬盘和热插拔电源,超强的数据外理能力和群集性能等。企11级服务器具有较高的容错能力,优良的扩展性能,故障预报警,在线诊断等功能。通常,采用 64 位的 Linux 或Windows 服务器操作系统,企级服务器能够为 500 台左右的 PC 提供资源共享服务。适用于高速处理、高可靠与可用的大中型网络系统。
服务器按机箱结构划分,可分为台式服务器、机架服务器和刀片服务器,机架服务器1U(1U=1.75 英寸)、2U、4U 等规格。刀片服务器 10 个一组,安装在7U 的机框内,是一种高可用、高密度的服务器平台,适用于高密度、高性能计算环境。
三.德迅云安全好用ip
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