abstract
What is a server?
Server: also known as server, is a high-performance computer equipment to provide computer services
What is RAID?
RAID is a plurality of independent high-performance disk drives in the disk subsystem, thereby providing higher performance than a single disk storage and data redundancy techniques.
RAID features: a large-capacity, high-performance, reliability, manageability type
RAID0 low cost, high write performance, high 100% utilization of storage space, etc., but it does not provide data redundancy protection, once the data is corrupted, can not be restored. Therefore, RAID0 generally applicable to performance-critical data but not high security and reliability of applications, such as video, audio, storage, temporary data cache space.
RAID1 and RAID0 is just the opposite, in order to enhance data security so that two fully mirrored disk data presented, so as to achieve security is good, technology is simple, easy to manage. RAID1 has the ability to completely fault-tolerant, but the high implementation costs. RAID1 applied to sequential read and write data on the high performance requirements and application of paramount concern, such as protection of the data messaging system.
RAID1 mirroring is called, it will be exactly the same data are written to work and the mirror disks, its disk space utilization is 50%. RAID1 when data is written, the response time will be affected, but when reading data is not affected. RAID1 provides the best data protection, once the work disk failure, the system automatically reads the data from the mirrored disk, it will not affect the user work.
What is a cluster?
A cluster is a group of independent, high-speed computer network of interconnected computers
Acronym computer cluster is a cluster computer system, it is highly connected closely together to complete a set of calculations by loosely integrated computer software / hardware.
What is a network?
It refers to a computer network having different geographical features independent multiple computers and peripheral equipment, connected via a communication line, in the management and coordination of network operating systems, network management software and network communication protocols, sharing resources and information computer system delivery.
What is a switch, a local area network?
Switch (Switch) meaning "switch" is an electrical (optical) signal forwarding network device.
LAN refers to interconnected by a plurality of computers in a group of computers within a region
What is the network topology, rack?
Network topology (Network Topology) structure refers to a medium used to interconnect the various devices transmit the physical layout. That means the virtual i.e. real arrangement, or logical network among members constituting the specific physical.
Rack: storage cabinet can be simply understood as a server.
NIC Introduction
Why high-speed rail fast?
Because the high-speed rail uses a distributed kinetic energy, while the old train uses a centralized kinetic energy