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and relatively inexpensive. If Joe or Mary's website becomes more popular, Irene Network service provider can provide Joe or Mary with more servers right awayIn this example, the browser sends an HTTP request to www.joes-hardware.com to the IP address of the Joe Server, sending a request to www.marys-antiques.com to the Mary server (different from Joe) 's IP addressVirtual HostingMany people want to show themselves on the web, but their website is no

Chen Kozhan===========Typically, our disks are MBR partitioned tables, but MBR disks can only support up to 2T of space, so for more than 2T of space will have to takePartitioning tables with GPT============================================1, hard disk partition: A hard disk can be divided into multiple partitions, each partition is independent of each other, access to each partition is like access to a hard disk together;2. Partition type:Standard partition:/, swap, etc.; Note: /(Root partition

RaidPerformance of disks 1.定位 2.旋转 3.命令队列 4.数据库传输HBA: Host-based adapterRaid:redundent array of inexpensive Disks inexpensive disk arrayIndependent Standalone disk arrayLevel: Only used to identify the different ways of disk composition, can not replace data backup raid0：提高读写性能，没有容错能力。至少需要两块磁盘 100% raid1：至少需要两块硬盘，镜像，硬件容错能力，读性能提升，写性能下降 50% raid4：至少需要三块硬盘，允许一块盘出错，读写性能提升，（n-1）/n raid5: 至少需要三块硬盘，允许一块盘出错

First, RAID introductionRAIDAn inexpensive redundant disk array (redundant Array of inexpensive Disks), fromLinux 2.4kernel start,Linuxsoftware is availableRAID, you don't have to buy expensive hardwareRAIDcontrollers and accessories (typically medium-and high-block servers provide such devices and hot-swappable hard drives) can improve read and write performance by parallel processing of multiple independe

1. When executing scripts, you can use./or. ./(dot space dot slash) to execute scriptThe./means that another shell is started to execute the script (another process), so when a slash executes the script, the environment variables set will end with the process exiting, where the environment variable settings do not work for the current shell.. ./equivalent to source./execute the script, source is the command in the execution script, that is, the command is executed in the current process, so the

In the 2013 era of the Internet, whether computers or mobile phones, even television and watches are used on the network, but some need wireless network, such as smart phones and smart watches because of small size, can not design a network connection port, can only use wireless convenience to achieve the Internet. So most families in order to be able to let the family's mobile phone or tablet computer Internet, installed wireless router, wireless router now cheap affordable,

: Internet server usage is an important application of Linux. Internet and intranet servers based on Linux and Apache are inexpensive, performance-friendly, and easy to maintain. In the United States, most inexpensive servers are based on Linux. According to Infobeads's review, 26% or more ISPs are using Linux. Linux can be used as WWW server, domain name server, firewall, FTP server, mail server and so on

, generally speaking, this time will also have some money, so add some webserver server, in this add webserver server process, there may be several challenges:1. Apache soft load or LVS soft load can not bear the huge amount of web traffic (request connection number, network flow, etc.) scheduling, this time if the funding allows, the plan is to buy hardware load balancing equipment, such as F5, Netsclar, Athelon and so on, If the funds are not allowed, the plan is to make the application logica

, SandForce, Samsung and JMicron, Phison and so on. Different company's product, the characteristic is different, the performance and the price difference is many. Some inexpensive SSD, basically use a few price comparatively inexpensive of the Taiwan series product, performance is fair, still more superior than mechanical hard disk. Medium and high-end products, most of the use of Marvell/sandforce chips.

protecting and restricting scarce computing resources, using ratios. The principle shown by the Windows. NET Framework is that computing resources are inexpensive and will be cheaper, but deployment capacity will retain most of the expensive resources. In short, if a project requires you to select one of several operating systems as a deployment platform, regardless of development costs, forcing (and retraining) the developer uses a single programmi

. ② Cable System: due to the difficulty of construction, whether the MDA area, HDA area or EDA area, are used OM3 optical cable (Wanchaodo mode cable) and OS1 optical cable (Single-mode optical cable) at the same time laying the way, because the optical cable products with the same sheath containing different types of fiber core products series, Therefore, this design will not have an impact on the project. The advantage is that all kinds of optical fiber modules can be allowed to access the

Windows 8.1 with Bing is a free version of Windows 8.1, bundled with Microsoft software and services, and Windows 7 users are free to upgrade. The blockbuster news made people ecstatic and began to imagine the free time of Windows. The leaked documents have poured cold water on people: Windows 8.1 with Bing is built for inexpensive Windows 8.1 devices and is available only to OEMs. The well-known explosive material website Wzor just released the "Wi

will become the IoT and M2M economy's hot-pay infrastructure. Combined with a stable currency, this technology will also become a viable candidate for human and machine payments. But for the sake of feasibility, the payment system based on the block chain must be fast, cheap and scalable. These features are what the current block chain is not good at. There are many extensibility methods such as fragmentation, side-connected, interactive authentication protocol or State channel. When these meth

hard Disk Interface The current hard disk interface type is not much, mainly IDE, SCSI, SATA three kinds. Many times the IDE replaces the Ultra ATA, many people are accustomed to the Ultra ATA hard disk is called IDE hard disk, but need to explain that the concept of the IDE is greater than ata--in principle all hard drive integrated controller design belongs to IDE,SCSI is no exception. Of course, with the IDE referring to ATA has become a lot of inertia, SATA began to distinguish between th

Today and our department's eldest brother 1*1, everyone face-to-face communication to the new project team ideas. But also i to the traditional commercial storage in the current Big Data cloud computing development in full swing of background, how to improve, fusion exchange my views. Traditional commercial storage, born in the mainframe, minicomputer era. At that time, all of the hard drive concentrated on a few racks, mainframe through fiber, iSCSI and other high-speed connection to the stora

Believe that many owners have been on Taobao to buy the experience of the host, the author has been on Taobao to buy the host but has reached a very unpleasant experience, the site because of the host problem Zooey problems, the results of their own SEO lag appears backwards. Today I simply based on Taobao on the virtual host of the baby sales and share some of their own purchase experience, hoping to help everyone dry, reduce unnecessary losses. 　Product One: Large mainframe, low price Many

relatively inexpensive space or VPS, in fact, the more inexpensive, the more impact user access. Our investment in space must not be stingy, some people's space can directly affect income, such as Advertising Alliance website, when users open your page found that loading is very slow, then it will close, at this time there may be no advertising code added to completion. Another aspect, the website opens qu

RAID (Redundant array of independent disk independent Redundant array) technology was proposed by the University of California, Berkeley, in 1987, initially to combine small, inexpensive disks in place of large expensive disks, while hoping that the disk will fail without damaging access to the data Development of a certain level of data protection technology. RAID is a redundant array of inexpensive disks

configuration, Or it can be replaced directly with more capable servers and higher-end storage systems.By comparing the two scale modes, it is easy to see the pros and cons of each.Scale Out Advantages:1. Low cost, it is easy to build a very powerful computing cluster with inexpensive PC Server;2. It is not easy to encounter bottlenecks, because it is easy to add the host to increase processing power;3. Single node failure has a small impact on the o

configured to automatically resolve Split Brain, from my previous test situation, not every time the solution is very satisfying, in some cases, there may be a complete failure of a node possible.3, the limit of the number of replication nodes, even the latest version of DRBD, can only support replication between three nodes at most.These limitations are a few of the limitations that now seem likely to have a greater impact on users. There are, of course, many other limitations to DRBD, and bef