RAID implementations 116.211.146.88

　Software RAID control chip and no dedicated I / O chip, to achieve full RAID functionality of the operating system and the CPU. Modern operating systems provide soft RAID support basically by adding a layer of software on the disk device drivers, provides an abstraction layer between the physical drive and logical drive. Currently, the most common operating system supports RAID level have RAID0, RAID1, RAID10, RAID01 and RAID5 and so on. For example, Windows Server supports RAID0, RAID1 and RAID5 three levels, Linux supports RAID0, RAID1, RAID4, RAID5, RAID6 and so on, Mac OS X Server, FreeBSD, NetBSD, OpenBSD, Solaris and other operating systems also support the appropriate RAID level.
　　Software RAID is implemented by the operating system, so the system partition can not serve as members of the RAID logical disks, software RAID does not protect the system disk D. For some operating systems, RAID configuration information stored in the system information, rather than individual as files stored on disk. So that when an unexpected system crash when you need to reinstall, RAID data will be lost. In addition, fault-tolerant disk technology is not equal to fully support online replacement, hot-plug or hot-swap, disk errors can support heat exchange with the operating system implementation-dependent, and some operating system heat exchanger.
　　Hardware RAID has its own RAID control processing and I / O processing chip, and even an array of buffer, the CPU utilization and overall performance are three types of implementations optimal, but also to achieve the highest cost. Hardware RAID usually supports hot-swap technology, to replace a failed disk in the system is running under.
　　Hardware RAID include RAID card and integrated RAID chip on the motherboard, server platform, multi-use RAID card. RAID card core consists of four parts RAID chip (CPU card on RAID), port, cache and battery. Wherein the port is supported RAID disk interface card type, such as IDE / ATA, SCSI, SATA, SAS, FC interfaces.
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