Hardware Software

1. DETAILED DESCRIPTION server hardware
   1) CPU effect: the arithmetic / control
   attention information:
   Approaches - server CPU number of pieces (a single two-way four 4)
   Audit - the task parallel processing capability server (software running generating process information)

   2) Disk effect: the data information is stored (permanently)
   attention information:
   Capacity - decision data storage capacity (minimum storage unit of Byte data (bytes))
   Unit conversion:
   system conversion method: 1KB = 1024 bytes 1MB = 1024 KB 1GB = 1024 MB 1TB = 1024 GB 1PB = 1024 TB
   Manufacturer conversion method: 1KB = 1000 bytes 1MB = 1000 KB 1GB = 1000 MB 1TB = 1000 GB 1PB = 1000 TB

           1TB硬盘: 实际硬盘容量是多少?
                    1TB*1000*1000*1000*1000/1024/1024/1024

   Interface - determines the efficiency of data reading
   SATA (household appliance) - SCSI - SAS (Server)

   Category - determines the data reading efficiency of the purchase price
   mechanical hard 4T-600 yuan + solid-state drive 512G - ??? (600+)

   Speed - data storage efficiency
   home environment: 5.4k 7.2k
   enterprise environment: 10k 15k

   3) Memory function: storing data information (temporarily) relieve pressure disk
   concern information:
   Program - developers write code information
   process - running the software
   daemon - has been running processes
   buffer - stored into memory (buffer - write data ), do not put the disk
   users to store data -> memory (buffer) -> save to disk buffer [online viewing does not exist to the hard disk temporarily stored in memory (buffer)]
   cache - stored in memory (cache area - read data), stored on disk
   user data is read -> memory (cache) <- data information disk (hot data) [things cache frequently read in the cache area]
   (hot frequently used data data)
   4) power effect: power to the server hardware
   attention information:
   redundant (Rong) ability I - backup capability (instead of the battery, temporary emergency)
   a plurality of power modules deployed battery (UPS uninterrupted power supply system) for emergency use and emergencies enable the company to handle emergencies such as the case of tools: generators

   5) Array card effect: Several hard disks integrated into a logic
   1) enhance the capacity of a single disk (multi-block as one)
   2) to enhance data storage efficiency (s working together)
   3) to enhance data security (backup)

   6) Remote Management Card function: remote host open / batch remote mounting system

2. Server data storage method for
   highly concurrent storage / read data (portal)
   for storing data: CPU receiving and processing data -> save memory -> permanently saved to disk to ease storage pressure
   reading data: CPU receiving and processing data -> Memory read <- hot read data on the disk to enhance the efficiency of
   low concurrent memory / read data (SME) when accessed by the user, reading and writing where less
   storage data: CPU data reception process -> permanently saved to disk
   reads data: CPU data reception process -> memory read <- hot data read improve the efficiency of disk v
3. Servers Work Description
   User Action -> input device (keyboard, mouse, tablet) -> CPU (control and management of hardware memory drives) -> output device (monitor)
   Memory: Excessive equipment CTO (CPU) -> line manager - -> new employees (HDD) technology [CTO boss (cpu) is responsible for managing]
4. Sort server hardware
   CPU -> Memory -> LAN -> Disk (solid) -> mechanical hard drive
5. What is the operating system
   exchange intermediary (OS) between the man and the hardware
   part of the operating system components: a software program interpreter kernel
   Linux operating system characteristics:
   · stability characteristics of open source security (the code) free propagation (open source original)
   · multitasking characteristics multi-user management (multiple users can simultaneously use)
   embedded development (ATM machine ticket machine)