Shulou(Shulou.com)06/02 Report--

Basic hardware knowledge

L hardware knowledge equipment

L server components

L component details the number of cpu cores

L data storage scheme in the enterprise

# Core responsibilities of operation and maintenance personnel

1. Make sure that the data is not lost!

2. The server runs 24 hours a day.

3. Enhance the access experience of users! Access speed-come on!

# principles of operation and maintenance personnel

Simple, easy to use, efficient = simple and rude (add hardware)

I. basic commonly used software

1. Resource search software-everything

2. Screen sharing software-- Starscream software

FAQ 1: incorrect configuration of red spider

Solution: search Adapter.exe with resource search software

FAQ 2: red spider software jam

Solution: open the task manager, find the Starscream software process, and end the process.

3. Data sharing software-Feiqiu (does not need to be installed and used directly after decompression)

4. Screen capture software-Picpick

5. Drawing software-Yitu software

6. Remote assistance software-- teamviewer sunflower remote control software

7. Mind mapping software-- Xmind

Description of the types of computer hardware

1. Types of computers

Desktops, laptops, servers

2. Server classification: appearance classification

Rack server

Blade server (cost-effective) PS: can you imagine the kitchen knife shelf?

Tower server (personal server) PS: a must for techies

3. Server classification: size classification

1U server-thickness 4.45cm (17.5in)

2U server

4U server

4. Server classification: performance classification

PC Server X86 Server

Minicomputer server IBM HP (manufacturer)

Mainframe server cabinet in the oil (address exploration data operation) meteorological bureau (meteorological data operation).

5. Hardware components and functions of the server:

1) CPU: operation processing, sending control instructions. Is the core component of the computer. Common CPU brands are Intel and AMD (do not use if the heat dissipation is not good! )

The number of paths on the server refers to the number of CPU on the server (the maximum number of CPU that can be installed).

The number of cores of the server refers to the number of CPU cores of the server, the core handles server system tasks, and the ability to process tasks in parallel. If CPU (server) is compared to a factory, then the core (CPU) is the production unit of the factory. In other words, the more CPU, the stronger the ability to process data at the same time!

2) memory: its characteristic is that the capacity and processing speed directly determine the speed of computer data transmission. It is a memory that CPU can access directly. CPU reads instructions and data from memory and sends the operation results back to memory.

Data information is only temporarily stored in memory, which is only responsible for the transfer of computer data and cannot be saved permanently. If you shut down the computer or server, the data in memory will be lost.

In-memory programs: code information written by developers (finished products). Ps: a penguin communication software

Processes in memory: running programs generate processes (eating). Ps: in the video with my girlfriends

Daemon: once running, it can run forever without human intervention and special circumstances (blood circulation of the heart). Ps: I have been making videos with my girlfriends.

Buffering in memory: when Buffer data is written, it is queued to be saved on the hard disk.

In-memory cache: Cache writes hot data to the cache, making it easier for customers to read the data more quickly.

* how to store data in an enterprise

Large enterprises: large concurrency (data reading and writing efficiency)

User data-write-> Save to memory (buffer)-fixed quantity-> Storage to hard disk

User data-read-> read from memory (cache) and stored to hard disk

User data-read-> read from memory (cache) memory > network card > hard disk (solid state > mechanical)

4) Power supply:

ATX power supply: mainly used for desktops, workstations and low-end servers

SSI power supply: suitable for all grades of servers.

The server power supply should be redundant:

1. Multiple power supplies

2. Uninterruptible power supply system UPS (10-60 minutes)

3. Generator (bank)

5) Array cards: improve disk capacity, disk security and disk performance.

Raid0: advantages to improve data storage efficiency

Disadvantages: the security of data storage is not high (enterprises will not adopt Raid0)

Raid1: advantages to improve storage security

Disadvantages: low efficiency of data storage

Raid5: advantages: high storage efficiency and high security

Disadvantages: a piece of disk capacity will be wasted on disk capacity

Redundancy from good to bad: Raid1 > Raid10 > Raid5 > Raid0

Performance from good to bad: radi0 > raid10 > raid5 > raid1

Cost from low to high: raid0 > radi5 > raid1 > raid10

6) remote management card: the server shutdown status control service runs, using the remote network to install the system. (mainly used for remote boot! )

7) Cabinet:

The cables connected to the server in the cabinet should be marked.

Cable arrangement in cabinet

8) operating system

Concept: a bridge between people and hardware

Composition of the operating system:

1) system kernel (control hardware, machine language [binary information])

2) interpreter (bash interpreter [machine language translation software])

3) Software programs (C language class, JAVA language, Python and other computer programming languages)

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.