According to the implementation mode, it is divided into software and hardware.
Software RAID:
The CPU is mainly used to process array storage jobs. The disadvantage is that it consumes more CPU resources and computes RAID. The advantage is that the price is low. There are 3 categories:
Motherboard-based disk arrays: Only motherboard support is required (usually the chipset's built-in RAID features, such as Intel Matrix RAID), and no disk array cards are required. If the motherboard is damaged, it may be difficult to purchase the same motherboard to rebuild the RAID.
Hardware-Assisted RAID: A Fake RAID-based RAID card is required, as well as drivers provided by the manufacturer, but such RAID cards are still operated by the CPU. This RAID is easier to migrate to other computers. The RAID function is provided by vendor drivers and CPU operations running on the operating system.
The RAID function of the operating system: Linux, FreeBSD, Windows Server and other operating systems have built-in RAID functions, and some desktop versions of Windows also support RAID functions.
Hardware RAID (Hardware RAID)
The built-in processor on the RAID card does not require the CPU operation of the server. The advantage is that the read and write performance is the fastest, does not occupy the server resources, can be used for any operating system, can also read the hard disk through the backup battery module (BBU, Backup Battery Unit) and non-volatile memory (NVRAM) after the system is powered off. The remaining read and write jobs contained in the journal are recorded in the memory. After waiting for the power supply to be undone, the log file data is retrieved by NVRAM, and then the read and write operations are completed, and the remaining read and write operations are completed safely to ensure read. Write integrity. The backup battery module usually cooperates with the Write-Back cache mode of the array card, so that the memory cache read and write operations can obtain higher read and write performance; however, the hardware disk array card of the battery module is not backed up, and the Write-Back cache is not used. Mode to avoid loss of read and write data due to power outages. In addition, because the hardware disk array card is equipped with a built-in processor, it can be separated from the system, and various operations can be performed on the hard disk, and the restore operation is faster than the software disk array. The downside is that it sells at a high price and is usually only used for RAID 5 and RAID 6.
Rectifier Diode(Standard Diode)
Rectifier Diode(Standard Diode) utilizes the unidirectional conductivity of the diode, which can convert the alternating current of alternating direction to a pulsating direct current of a single direction. Rectifier diode – diode designed for rectifying alternating current (mostly with low power frequency – 50 Hz at high power emitted during load). The main task of the rectifier diode is to convert AC voltage into DC voltage through application in rectifier bridges. The variant of rectifier diodewith the Schottky barrier is particularly valued in digital electronics.
Rectifier Diode,Standard Diode,High Power Rectifier Diode,High Voltage Rectifier Diode
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