Von Neumann architecture: CPU (control + + register operator), memory (hard disk, a random access memory RAM (such as memory, etc.), a read only memory ROM (such as BIOS and CMOS, etc.)), input devices, output devices
operation and maintenance staff responsibilities:
data can not be lost; 724 reliable work; improve the user experience
the basics of server:
the basic unit of 1U = 1.75 = 4.45cm Yingcun
Specifications: 1U, 2U, 4U
rack generally 20-30U
server Category: rack, tower type, blade
internet company server brand:
DELL (most companies, commonly used)
| time | 1U | 2U |
|---|---|---|
| 10 years ago | 1850/1950 | 2850/2950 |
| 13 years ago | R410, R610 | R710 |
| 16 years ago | R420/R430、R620/R630 | R720 / R730 |
HP
华为
IBM
浪潮
联想ICT = IT + CT = = IOT internet cloud
authentication
storage IE
cloud IE