1. Computer configuration
Host: CUP, memory, hard drives, motherboard, power peripherals: :( input keyboard, mouse, scanner, camera) :( output display, audio, headsets, printers)
2. The operation and maintenance of introduction
The core functions of the operation and maintenance of data can not be lost 7 * 24-hour operation to enhance the user's satisfaction (site visits - speed - fast)
3. The content of the daily work of operation and maintenance personnel
Daily server maintenance, fault handling emergency line service code to complete the project (backup project, project control, etc.) without service monitoring website optimization combing summary document, the formation of a system, and the implementation of the system. Other leading arrangements
4. Server
The server more stable structures used for the site. Server, mainly to provide computing services equipment.
The size of the server
Are classified according to height: units of U (unit) 1U = 1.75 Yingcun = 4.445cm. 1U 2U 4U is commonly classified according Appearance: rack-mounted servers, similar to a drawer, in the above 19-inch rack standard. Blade servers, similar to the books on the bookcase. Tower server, the server more robust , with the usual vertical pc machine almost.
6. The server brands
Dell (up to) the HP IBM (most expensive) Lenovo Space Unisign wave (domestic headquarters in Jinan, Shandong)
7.Dell common server models
Server to see the official website. Looking to buy server sales. Sports Internet companies, to IOE movement. In May 2012, Alibaba Group has put forward I IBM server O Oracle database, Oracle E EMC storage
Server core components
Power, CUP, memory, hard drives, raid cards, optical drives, remote management card Power SSI ATX and ATX apply to ordinary computer SSI according to the update server technology and developed for various grades of the server. Dual power supplies and AB line how to make server uninterrupted operation (uninterruptible power supply)? 1) dual power supplies and AB line 2) UPS uninterruptible power supply (battery) power supply provides 10 to 30 minutes 3) diesel generator tank + 4) nearby gas station with emergency oil supply agreement signed
CPU
Common brand Intel AMD units are not stars, in the server, the unit is the road, a = single, 2 = two-way R720 Dell server models What does it mean R = T = rack server tower server blade M = server 7 = is a single dual 1-3 4-7 8 also is a dual four-bis 9 also is a quad 2 = 0 indicates algebraic 12th generation tenth generation, so the back 0 = CPU brand 0 AMD is that Intel 5
RAM
Memory is a temporary memory. Features: memory capacity and processing speed of the computer directly determines the speed of data transmission. When the program runs generally will be dispatched to perform memory, or the server is turned off to shut down, data is automatically freed from memory. Memory and CUP, together known as the Big Three hard disk of the computer. What are the procedures, processes, daemons program: php, c, java, python out of the written code files, static. Process: code files running processes = daemon: Code = file has been running daemon buffer and Cache buffer write data into memory, this memory space to store data into the buffer, that buffer, write data to memory It is a buffer. is read from the cache data memory, this memory space to store data for caching, i.e. cache, the data is read from the cache memory. Business Case: enhance the user experience solutions 1. Large sites, high concurrency, when large amounts of data written after the first write data into memory, accumulated to a certain amount or timing stored to disk, data should eventually loaded into memory provide external access. Pros: Performance will be particularly fast. The disadvantage is: will lose some had not had time to data stored in the disk. 2. small and medium sites for concurrency is not large, the data is not particularly large sites, you will first write the data to disk and then writes the data written to disk into memory by the program, and then provide access services via the external memory. Summary: According to your different needs of different options.
hard disk
Commonly used hard drive size, usually 3.5 inches. Classification hard disk interfaces: the stage of history (IDE SCSI) SAS (server standard) SATA (civilian) PCIE (M2) (solid) machine and solid: the type of disk size: B KB MB GB TB PB 1KB = 1024B 1MB = 1024KB 1024MB = 1GB 1TB = 1024GB 1PB = 1024PB
raid card (array card)
The server comes standard, and now all of the hard disk must raid. Benefits: all the hard disk capacity = added together can make the data more redundancy (security) can achieve higher performance raid levels: RAID0 (stripe) have at least one hard drive, so the hard disk capacity of the sum, the fastest read and write 0 worst RAID1 (mirroring) at least two. Only half capacity, read ok, write slowly. % 100 RAID5 a capacity at least three losses, slower write, read ok, most damage a raid10 loss of at least four half-capacity, quickly read, damaged half enterprise application scenario according to the needs of data storage and access, to match the corresponding raid level
CD-ROM
Not using it to install the system, and now U disk installation and network installation.
Remote Management Card
idrac integrated with Dell remote control card
operating system
Windows linux UNIX DOS the FSF the GNU project (emsc, bash, gawk) GPL agreement IT server embedded development personal PC desktop linux distributions Redhat CentOS Ubantu SUSE