26-07-2012, 04:10 PM
RAID Technology
RAID Technology.ppt (Size: 267.5 KB / Downloads: 37)
What is RAID Technology?
RAID is a method of combining several hard disk drives into one logical unit.
RAID technology was developed to address the fault-tolerance and performance limitations of conventional disk storage.
It can offer fault tolerance and higher throughput levels than a single hard drive or group of independent hard drives.
History
RAID technology was first defined by a group of computer scientists at the University of California in 1987.
The scientists studied the possibility of using two or more disks to appear as a single device to the host system.
Although the array's performance was better than that of large, single-disk storage systems, reliability was unacceptably low.
To address this, the scientists proposed redundant architectures to provide ways of achieving storage fault tolerance.
However, it does offer maximum throughput for some data-intensive applications such as desktop digital video production.
RAID Levels
There are several different RAID "levels" , each with inherent , and availability (fault-tolerance) characteristics designed to meet different storage needs.
No individual RAID level is inherently superior to any other.
Each of the five array architectures is well-suited for certain types of applications and computing environments.
For client/server applications, storage systems based on RAID levels 1 and 5 have been the most widely used.
Conclusion
Grown more complex
Large price range
Huge step forward for industry
RAID Technology.ppt (Size: 267.5 KB / Downloads: 37)
What is RAID Technology?
RAID is a method of combining several hard disk drives into one logical unit.
RAID technology was developed to address the fault-tolerance and performance limitations of conventional disk storage.
It can offer fault tolerance and higher throughput levels than a single hard drive or group of independent hard drives.
History
RAID technology was first defined by a group of computer scientists at the University of California in 1987.
The scientists studied the possibility of using two or more disks to appear as a single device to the host system.
Although the array's performance was better than that of large, single-disk storage systems, reliability was unacceptably low.
To address this, the scientists proposed redundant architectures to provide ways of achieving storage fault tolerance.
However, it does offer maximum throughput for some data-intensive applications such as desktop digital video production.
RAID Levels
There are several different RAID "levels" , each with inherent , and availability (fault-tolerance) characteristics designed to meet different storage needs.
No individual RAID level is inherently superior to any other.
Each of the five array architectures is well-suited for certain types of applications and computing environments.
For client/server applications, storage systems based on RAID levels 1 and 5 have been the most widely used.
Conclusion
Grown more complex
Large price range
Huge step forward for industry