![]() ![]() With software-based RAID, the controller uses the resources of the hardware system, such as the central processor and memory. ![]() A physical RAID controller can also be built into a server's motherboard. The controller can also be designed to support drive formats such as Serial Advanced Technology Attachment and Small Computer System Interface. In a hardware-based RAID product, a physical controller manages the entire array. Using a RAID controller can improve performance and help protect data in case of a crash.Ī RAID controller may be hardware- or software-based. It can be used as a level of abstraction between the OS and the physical disks, presenting groups of disks as logical units. RAID controllerĪ RAID controller is a device used to manage hard disk drives in a storage array. In a multiuser system, better performance requires a stripe wide enough to hold the typical or maximum size record, enabling overlapped disk I/O across drives. In a single-user system where large records are stored, the stripes are typically set up to be small (512 bytes, for example) so that a single record spans all the disks and can be accessed quickly by reading all the disks at the same time. Disk mirroring and disk striping can also be combined in a RAID array.Īn image of a hard drive in a RAID array. The stripes of all the disks are interleaved and addressed in order. Each drive's storage space is divided into units ranging from a sector of 512 bytes up to several megabytes. Striping partitions help spread data over multiple disk drives. Mirroring will copy identical data onto more than one drive. RAID employs the techniques of disk mirroring or disk striping. RAID arrays appear to the operating system (OS) as a single logical drive. Because using multiple disks increases the mean time between failures, storing data redundantly also increases fault tolerance. RAID works by placing data on multiple disks and allowing input/output (I/O) operations to overlap in a balanced way, improving performance. There are different RAID levels, however, and not all have the goal of providing redundancy. RAID (redundant array of independent disks) is a way of storing the same data in different places on multiple hard disks or solid-state drives (SSDs) to protect data in the case of a drive failure. ![]()
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