2.7. RAID

A chapter about the history of storage wouldn’t be complete without a discussion of RAID technology. Yes, there can be vast collections of disk drives, but they are essentially defenseless against failure and data loss.

It argues, therefore, that, mass storage can’t succeed without the benefits of a great protection scheme: RAID. Along with redundant components, a hardware RAID solution is a key performance feature for modern high-availability disk arrays.

RAID stands for Random Array of Independent Disks (also known as Random Array of Inexpensive Disks). RAID technology groups individual disk drives into a logical disk unit that functions as one or more virtual disks. This can improve reliability, performance, or both.

RAID uses parity ...

Get Storage Area Networks: Designing and Implementing a Mass Storage System now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.