说到服务器托管，首先得了解的 ，肯定是他的一个外观，大小啦 ，一般是默认的 ，还有一个计算的是服务器的厚度 ，这个关系到一个费用方面的，还有就是为什么要选择服务器托管呀 ，这都是小伙伴们关心的问题啦 下面的内容也是一样，拿出来分析 ，一起探讨一下
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1、服务器的尺寸
通常所说服务器的"U"是一种表示服务器外部尺寸的单位，是unit的缩略语。
规定的尺寸是服务器的宽（48.26cm＝19英寸）与高（4.445cm的倍数）。由于宽为19英寸，所以有时也将满足这一规定的机架称为“19英寸机架”。
厚度以4.445cm为基本单位。1U就是4.445cm，2U则是1U的2倍为8.89cm（如此类推）。也就是说所谓“1U的服务器”，就是外形满足EIA规格、厚度为4.445cm的产品。设计为能放置到19英寸机柜的产品一般被称为机架式服务器。
2、什么是服务器托管服务？
服务器托管是指为了提高网站的访问速度，将您的服务器及相关设备托管到具有完善机房设施、高品质网络环境、丰富带宽资源和运营经验以及可对用户的网络和设备进行实时监控的网络数据中心内，以此使系统达到安全、可靠、稳定、高效运行的目的。托管的服务器由客户自己进行维护，或者由其它的授权人进行远程维护。
数据中心可以为客户的服务器提供机柜及带宽出租服务，使服务器可维持每星期七日、全日二十四小时不间断服务。当您有意建设自己的Web、Email、Ftp服务器，而您的网站的应用很复杂或您网站的访问率很高时,您可以选择自已购买服务器,进行整机托管。
3、为何不把服务器放在自己的办公室？
要在自己室内存放服务器，就必须建立空调环境、标准设施（例如24小时运作的机房空调系统、不间断电源系统等等）以及管理服务器和网络业务作出庞大而长远的投资。服务器托管服务尤其适用于下列情况：不愿购置额外硬件（例如：路由器）以提升服务器的连接速度；服务器受带宽所限无法提升网络连接速度。
服务器托管服务是性价比合适的企业上网、企业网络应用平台解决方案，在性能、保安、可靠性方面都达到高水平。
4、服务器托管与虚拟主机租用有什么区别？
“服务器托管”是在具有与Internet实时相连的数据中心（IDC）放置一台物理服务器，或向其租用一台物理服务器，客户可以通过远程控制将物理服务器配置成WWW、E-mail、Ftp等功能的应用服务器。
5、服务器被访问的速度由哪些因素决定？
A.服务器的硬件配置(包括服务器的类型、CPU、硬盘速度、内存大小、网卡速度等)
B.服务器所在的网络环境与Internet骨干网相联的速率
C.ChinaNet的国际出口速率
D.访问者的ISP(Internet接入服务提供商)与ChinaNet之间的专线速率
E.访问者的ISP(Internet接入服务提供商)向客户端开放的端口接入速率
F.访问者计算机的配置，Modem的速率、电话线路的质量等
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