system z mainframe

Thompson and DennisRitchie invented Unixon a minicomputer PDP-7. In 1971, they upgraded the mainframe to PDP-11.At the time, they used a storage disk called RK05, which was about 1.5MBin size.Because the capacity of the hard disk is very small, so long, the operating system storage disk data (root directory) has become more and more large, resulting in a disk can not fit the data. As a result, they added a

"world" different. Overall, before the C/s structure appeared, almost all the tasks related to data applications are performed by the hosts hosting the database management system, and the early performance of the data is basically done on the mainframe. And the database system has very limited interaction with the outside world. Although the distributed, host

First, the introduction Today, most of the voice, data and image transmission in office buildings, buildings, university campuses, government departments and even residential communities in intelligent buildings are based on structured cabling systems on their physical structure. We know that in the Iso/osi protocol, the physical layer is the basis of the network system, all network communications rely on the physical layer of the cable to the voice,

The reason why FreeBSD is used as the server operating system-Linux Enterprise Application-Linux server application information. The following is a detailed description. Since 2001, when DragonFly BSD, the last major branch, was released, FreeBSD, OpenBSD, NetBSD, and Mac OS X represent a new wave of innovation in the UNIX world. All these operating system branches comply with POSIX and provide a similar co

Whether Linux is a real-time system or a timeshare operating systemHttp://www.cnblogs.com/xiawen/p/3317302.html1. Real-time operating system definitionA real-time operating system (RTOS) is when external events or data are generated that can accept andprocessed quickly enough to control the production process or respond quickly to the processing

First, Linux System process start Flowchart:650) this.width=650; "src=" http://s5.51cto.com/wyfs02/M02/85/4B/wKioL1efOwWj4dSZAALQ_wbFT9Y490.jpg "title=" 3.jpg " alt= "Wkiol1efowwj4dszaalq_wbft9y490.jpg"/>Second, a brief description of the Linux system from the boot to the landing interface of the boot process1. boot BIOS self-test2.MBR Boot3.grub boot Menu4. loading the kernel5. Start the init process6. rea

1. The content of this article comes from courseware and student notes of famous universities (on campus, I often see someone buying notes at high prices)2. The instructor does not provide references, so he can only express his gratitude to the author. If your work is referenced, you can reply to the document to supplement the reference.3. I will not answer questions not related to the article, and the article content is also difficult. I am also difficult to answer your questions. If you find a

Abstract: With the development of the motherland's modernization, the construction of new urban transportation-underground railway is in the ascendant. With the continuous development of automation technology, the centralized control and management of subway mechanical and electrical equipment, especially the environmental control equipment, provides the possibility for the scientific and efficient operation of subway environmental control equipment, at the same time, it ensures the security and

The system name is barebone or bare system. It is a brand new computer. It is different from a notebook or a desktop, and its size is between a desktop and a notebook. Generally, the admission system only has accessories such as chassis, motherboard power supply, and motherboard. There are no accessories with changing prices, such as CPU, memory, and hard disk. S

Back scene Hospital Information Systems mainly include his (Hospital Information System) system, Lis (Laboratory Information System) system, and PACS (Picture Archiving and Communication System) system. His

Windows supports both FAT32 and NTFS file systems. FAT32 is longer than compatibility, and NTFS is longer than system security. On the premise of meeting the application requirements, how can we set a file system to make full use of the features of windows? Before discussing this issue, let's take a look at the features of the FAT32 and NTFS file systems. FAT32 File S