Video and Media Servers: Technology and Applications, Second Edition
An excellent practical guide, this second edition continues to provide a technical understanding of professional digital video recording systems.
TABLE OF CONTENTS Video and Media Servers: Technology and Applications, Second Edition
Chapter 31: RAID by the Numbers
Overview
In 1993, the first edition of The RAIDbook was published by the RAID Advisory Board. This book formed part one of the RAID Advisory Board's objectives the standardization of terminology for RAID-related technologies.
By 1997, the RAID Advisory Board (RAB) had recognized nine RAID implementation levels. Of the nine levels, five conformed to the original Berkeley RAID terms that were developed from the 1988 researcher's efforts. Beyond those five, there are four other RAID terms that are used and acknowledged by the RAB.
RAID 0, RAID 6, RAID 10, and RAID 53 were developed through committee work anchored by manufacturers, suppliers, and consumers. These additional extensions will be explained at the end of this chapter.
A drive array cannot be created by simply connecting a series of SCSI drives to a single SCSI controller. An array must consist of electronics that format, code and distribute data in some structured form across all of the drives. A RAID system consists of a specialized set of electronics and instructions that operate in conjunction with the various drives to perform protective and fault tolerance functions necessary to meet the level of RAID designated.
Most servers, whether on a Windows NT platform or for a digital video server, employ some form of RAID. This chapter will be concerned with hardware RAID control, although software RAID is available on some video servers in the form of patented and proprietary subsystem controllers (e.g., Leitch/ASC Video Corporation's VR series uses a proprietary FibreDrive system to interconnect...
Copyright Butterworth-Heinemann 2001 under license agreement with Books24x7
