Manhattan Computer Products 160377 user manual What Is Raid?

WHAT IS RAID?

RAID (redundant array of independent disks) technology manages multiple disk drives to enhance I/O performance and provide redundancy in order to withstand the failure of any individual member without loss of data. The following RAID-related terms are used in this manual.

Disk Striping (RAID 0): Striping is a performance-oriented, non-redundant data mapping technique. Striping arrays use multiple disks to form a larger virtual disk.

Disk Mirroring (RAID 1): Disk mirroring creates an identical twin for a selected disk by having the data simultaneously written to two disks. If a read failure occurs on one drive, the system reads the data from the other drive.

Mirrored-Striping (RAID 0+1, or RAID 10): A Mirrored-Striping Set provides the performance enhancements of Striping and the data availability and integrity of Mirroring. When data is written to a Mirrored-Striped Set, a second (Mirrored) virtual disk is created, as well.

Parity RAID (RAID 0): Parity, or RAID 5, adds fault tolerance to Disk Striping by including parity information with the data. It uses less capacity for protection and is the preferred method to reduce the cost per megabyte for larger installations.

Just a Bunch of Disks (JBOD): The JBOD is a virtual disk that can either be an entire disk drive or a segment of a single disk drive. For this card, the JBOD function only supports one disk.

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