A: computer hardware Type Description
1. Server Category:
<1> Appearance Category: Rack, tower, blade / server.
<2> Size Category: 1U , 2U , 3U
<3> Performance Category: PC servers, minicomputers server, server machines to play.
Two : server hardware part
1.CPU: arithmetic processing / hardware processing. a.CPU large ones: server cpu number of stars. b.cpu audit: the CPU cores. The core server processing system for processing tasks and mission capability.
2. Fan: Cooling
3. Memory: Temporary storage of information / may be lost .
Storing user data cpu- store data instruction - Hard
Program: to write good code information developers.
Process: program running process will produce.
Daemon: run up and not stop.
Cache: Cache read caching hot data storage.
Buffer buffer data - buffer - hard disk storage.
- Hard disk: permanently store data information .
Hard disk interface type: IDE SATA scsi SAS (server mainstream Interface)
- Power: power supply capacity, the server must have the power redundancy.
<1> has a plurality of power on the server <2> uninterruptible power supply UPS <3> Generator
6. NIC: data transmission.
7. Array card : multiple drives may be integrated as a disk, disk capacity increases, improving disk performance, improve safety disk.
Disk arrays using the card will integrate: configure the array ( RAID ) process. Configure different raid levels:
<. 1> raid0 : for increased data storage efficiency, storage security is not high, the enterprise is generally not used raid0 configuration
<2> raid1: improve storage safety, less efficient,
<3> raid5 storage efficiency high safety. Disadvantages: Some will waste disk capacity.
8. Remote Management Card: servers running off state control server, a remote network system installation.
9. Cabinet: cable enclosure should sort server, labeled.
10: hardware performance comparison: the CPU> inside > NIC > Hard > ,,,
11: How the enterprise data storage
Large enterprises: the large amount of concurrency, data reading and writing focus on efficiency.
Write: a user data - stored in memory (buffer) - time quantitative saved to the hard disk
Read : user data - read from the memory - hotspot data is stored to the hard disk
SMEs : Concurrent small amount to ensure data security.
Write: User data - stored in the hard disk
Read: a user data - stored in memory (buffer ) - hotspot data is stored to the hard disk.
12 : What is the operating system
Operating system: people communicate with hardware bridge
The operating system: the peripheral software programs, system kernel interpreter.
Three : linux birth and development of the history of the system :
1.linux system release:
Redhat-- the field of Internet server, usually foreign and state-owned enterprises to use.
centes-- the field of Internet server, usually private use.
Ubuntu-- home terminal computer, the graphical interface.
Debian / FreeBSD-- system security is relatively high neighborhood, high safety and stability.
suse-- network service companies need to act as a route to use.
2.Linux VM installation:
1> Countdown interface, configure the card name information.
2> system system configuration information
a. configure network and host information.
B. system partitioning.
3> software configuration.