How much do you know about the interface types of Linux disks?
The disk interface is a continuous component between the disk and the host system. Its function is to transmit data packets between the disk cache and the host memory. The unused disk interface determines the connection speed between the disk and the computer. In the entire system, the disk interface The quality of the program directly affects the speed of the program and the performance of the system. From the overall point of view, the disk interface is divided into four types: IDE, SATA, SCSI and Fibre FC channel .
1. SATA disk and SATA interface
Disks using SATA ports are also called serial disks. Currently, the mainstream of PC disks, Seeial ATA adopts serial connection mode, and the serial ATA bus uses embedded clock signals, which has a stronger error correction ability, which is not comparable to the previous one. The biggest difference is that the transmission command can be checked, and if any errors are found, it will be automatically corrected, which greatly improves the reliability of data transmission. The serial interface also has the advantages of simple structure and support for hot swapping . Reliable, simple, hot-swappable, and high-performance, SATA is the mainstream of current PC and server disks .
2. SCSI disk and SCSI interface
The full English name of SCSI is " small computer system interface " , which is a completely different interface from IDE (ATA). High-speed data transfer technology on minicomputers . The SCSI interface has the advantages of application range management, multi-tasking, large bandwidth, low CPU usage, and hot swapping. Because of the high price, it is difficult to popularize like IDE disks. Therefore, SCSI disks in the early years were mainly used. in mid- to high-end servers and high-end workstations .
3. SAS disk and SAS interface
SAS is a new generation of SCSI technology, which is the same as the popular serial ATA (stat) disk. Both use serial technology to achieve higher transmission speed and improve internal space by shortening the connection cable. The design of this interface is to improve the performance, availability and scalability of the storage system, and to provide compatibility with Serial ATA (serial ATA abbreviated as stat) disks.
SAS technology and SAS disks were born on the basis of people's desire to take advantage of the common advantages of STAT and SCSI interfaces. So what are the advantages of SAS technology ? 1) SAS technology reduces the cost of disk arrays ; 2) Serial interface improves transmission performance ; 3) Better expansion performance ; 4) Simpler installation ; 5) Better compatibility .
4. Fibre Channel
The English spelling of Fibre Channel is Fibre Channel. Like the SCSI interface, Fibre Channel was not an interface technology designed and developed for disks at first. In the disk system, the Fibre Channel disk was developed to improve the speed and flexibility of the multi-disk storage system, and its appearance greatly improved the communication speed of the multi-disk system. Mainly used for high-end workstations, servers, mass storage subnets, etc. Hot plugging, high bandwidth, long-distance connectivity, and a large number of connected devices are the main characteristics of Fibre Channel.