IDE: English abbreviation for Integrated Drive Electronics, which is meant to refer to the hard drive that integrates the controller with the disk. Usually, what we mean by IDE refers to an interface technology of devices such as hard disks. The hard disk using the interface has low manufacturing cost, low price and convenient installation. However, the CPU usage is high, the speed is slow, and hot swapping is not possible, and the data reliability protection required by the harsh environment cannot be provided. So most of them are used in low-end entry-level server products. SCSI: English abbreviation for Small Computer System Interface, which is a small computer system interface. The biggest advantage of a hard disk with this interface is that it has self-management capability, so it requires only a small amount of CPU resources in actual operation, and can be multitasking. The transmission rates of the serial devices are independent of each other, supporting hot swapping and stabilization. More highly, it is the most common hard disk interface in server products. //This article from the application of computer hardware and software network www.45it.com
RAID: English Redundant Array of Independent Disks abbreviation, that is "redundant array of independent disks", sometimes also referred to as disk arrays. Simply put, RAID is a combination of multiple independent hard disks in different ways to form a hard disk group, which provides higher storage performance and data backup technology than a single hard disk. In the user's opinion, the composed disk group is like a hard disk, and the user can partition, format and so on. In summary, the operation of the disk array is exactly the same as a single hard disk. The difference is that disk arrays are much faster than a single hard disk and can provide automatic data backup. Two major characteristics of RAID technology: speed and security. Because of these two advantages, RAID technology was first applied to the hard disk system of SCSI interface in advanced servers. With the development of computer technology in recent years, many server vendors have also IDE-based RAID has been introduced, but due to the innate disadvantage of the IDE interface, it is limited to processing small amounts of data, and the sudden data requirements for large traffic are powerless. Hot Swap
: i.e., hot-plugging or Hot Swap, which allows users to remove and replace the damaged hard disk and the like, or power supply board member without shutting down the system, do not turn off the power, thereby improving the system Timely recovery, scalability and flexibility for disasters. Hot swapping requires support in the following areas: bus electrical characteristics, motherboard BIOS, operating system, and device drivers. So, in general, a complete hot-swap system includes hardware for hot-swappable systems, hot-swappable software and operating systems, hot-swappable device drivers, and hot-swappable user interfaces. Specific to the server products, the components that may be hot-swapped mainly include hard disk, CPU, memory, power supply, fan, PCI adapter, network card, and so on. When purchasing a server, be sure to pay attention to which components are hot swappable, which is critical for future work.
SMP: i.e., "Symmetric Multi Processing" (Symmetrical Multi-Processing) technology, refers to a collection of a group of processors on a computer, the shared memory subsystem, and the bus structure between the CPU. In this architecture, a computer is no longer composed of a single CPU, while multiple processors run a single copy of the operating system and share memory and other resources of a computer. Although multiple CPUs are used at the same time, from a management point of view, they behave like a single machine. The system distributes task queues symmetrically across multiple CPUs, greatly improving the data processing capabilities of the entire system. All processors have equal access to memory, I/O, and external interrupts. In a symmetric multiprocessing system, system resources are shared by all CPUs in the system, and workloads are evenly distributed across all available processors.