摘要: 从系统架构来看,目前的商用服务器大体可以分为三类,即对称多处理器结构(SMP:Symmetric Multi-Processor),非一致存储访问结构(NUMA:Non-Uniform Memory Access),以及海量并行处理结构(MPP:Massive Parallel Processing)。它们的特征分别描述如下:SMP(Symmetric Multi-Processor)所谓对称多处理器结构,是指服务器中多个CPU对称工作,无主次或从属关系。各CPU共享相同的物理内存,每个CPU访问内存中的任何地址所需时间是相同的,因此SMP也被称为一致存储器访问结构(UMA:Uniform M 阅读全文
posted @ 2014-03-22 21:12 hare101 阅读(716) 评论(0) 推荐(0)
摘要: chapter 1解决计算能力不足的问题,不是去制造更大的计算机,而是用更多的计算机来解决问题。我们生活在一个数据的时代。“大数据”的到来不仅仅是影响到那些科研和金融机构,对小型企业以及我们个人都有影响力。datanodetasktrackernamenodejobtrackersecondary namenodeHDFS Clusters don't benefit from RAID fro datanode storage(It's OK for namenode).为了方便集群的安装,推荐使用自动化安装方法,比如Red Hat的Kickstart或者是Debian的Fu 阅读全文
posted @ 2014-03-17 22:37 hare101 阅读(596) 评论(0) 推荐(0)
摘要: VMWare提供了三种工作模式: 1.bridged(桥接模式) 在这种模式下,VMWare虚拟出来的操作系统就像是局域网中的一台独立的主机,它可以访问网内任何一台机器。在桥接模式下,需要手工为虚拟系统配置IP地址、子网掩码,而且还要和宿主机器处于同一网段,这样虚拟系统才能和宿主机器进行通信。使用桥接模式的虚拟系统和宿主机器的关系,就像连接在同一个Hub上的两台电脑。 如果你想利用VMWare在局域网内新建一个虚拟服务器,为局域网用户提供网络服务,就应该选择桥接模式。 2.host-only(主机模式) 在某些特殊的网络调试环境中,要求将真实环境和虚拟环境隔离开,这时你就可采用hos... 阅读全文
posted @ 2014-03-12 22:11 hare101 阅读(4194) 评论(1) 推荐(0)
摘要: 中继器就是一个信号放大设备,它从一个网络电缆里接受信号,然后进行放大,然后再将信号送入下一个连接的网络电缆。集线器(Hub),工作在物理层,相当于多口的中继器,可以把若干机器连接起来组成一个LAN,采用共享带宽的工作方式,整个Hub就是一个冲突域,采用CSMA/CD机制检测和侦听,但是hub对数据包是进行广播传送的,网桥,工作在数据链路层,是连接两个局域网的存储转发设备。网桥将两个LAN连起来,根据MAC地址来转发帧,可以看作一个“低层的路由器”。 交换机,相当于多口的网桥。网关(Gateway),网关实质上是一个网络通向其他网络的IP地址。比如有网络A和网络B,网络A的IP地址范围为 “19 阅读全文
posted @ 2014-03-12 20:33 hare101 阅读(385) 评论(0) 推荐(0)
摘要: http://v.youku.com/v_show/id_XNTc2Nzg5MTMy.html?firsttime=119Roger Federer this is you life how much you remember your career so far.OK, go , all about you. so when did you first win ATP title win? Milan Winbledon titlehow many career double titles do you hold?Eight. Correct.out top 10? Top 10? 20.. 阅读全文
posted @ 2014-02-09 10:20 hare101 阅读(332) 评论(0) 推荐(0)
摘要: talk about Mike Jordan , talk about Tiger Woods, their competitor when people discuss youI love wining and other guys I hate losing , you know because I enjoy what wouldproud of most in your career probably win the winbeldonfirst time and then becomeNo. 1 2004we never talk about go to lockerbeing .. 阅读全文
posted @ 2014-02-08 11:02 hare101 阅读(209) 评论(0) 推荐(0)
摘要: http://v.youku.com/v_show/id_XNTY3NTAwOTA4.html?firsttime=179Novak, very congradutlations, to reach semifinals , single-handed it'sdfficult to play one handed-backhand what is your favourite shots?single hand nowadays,it was the case , beforetwenty, thirty years ago, now a lot of two-handersmayb 阅读全文
posted @ 2014-02-07 10:49 hare101 阅读(189) 评论(0) 推荐(0)
摘要: chill out:chill out is a very common expression inEnglish nowadays, it means relax, calm down or take it easy.control feak/ neat freak / clean freak/ health freak / freak out: It freaks me out when I see : if you are chinese , please forward.pull out of : Azarenka pulls out of Doha and Dubai because 阅读全文
posted @ 2014-02-07 10:15 hare101 阅读(258) 评论(0) 推荐(0)
摘要: http://v.youku.com/v_show/id_XNTY4MTgzOTEy.html?firsttime=0Novak, can you take any confirt for quality of the match the moment , frustrating unbelievable match now , I can feel dispointed, I congradulate my opponent , because he showed courage in the right momentand win for her shots on the baseline 阅读全文
posted @ 2014-02-06 21:19 hare101 阅读(239) 评论(0) 推荐(0)
摘要: http://v.youku.com/v_show/id_XNjA3MjU3MzY4.html?firsttime=0Singapore how aboutanother hand trophy Ceremoney it's y pleaure to introduce the Chairman this match and two weeks spectacularhere at US Open around the world, thanks to all you two do , most importantly, I'd like to thank the fans, 阅读全文
posted @ 2014-02-06 20:30 hare101 阅读(384) 评论(0) 推荐(0)