What is the difference between hardware RAID and software raid?

We have explained what raid is and the two types of raid, today we want to discuss the difference between hardware raid and software raid, as many users have been confused by them. Brief introduction about Hardware RAID The hardware-based system manages the RAID subsystem independently from the host and presents to the host only a single disk per RAID array. An example of a Hardware RAID device would be one that connects to a SCSI controller and presents the RAID arrays as a single SCSI drive. An external RAID system moves all RAID handling “intelligence” into a controller located in the external disk subsystem. The whole subsystem is connected to the host via a normal SCSI controller and appears to the host as a single disk. RAID controllers also come in the form of cards that act like a SCSI controller to the operating system but handle all of … Continue reading

Explanation about RAID, hardware raid and software raid

As computer hardware become cheaper and cheaper, many users begin to use RAID and larger hard disks. To the people who want to use RAID, you’d better make it clear that what RAID is and what the kinds of raid are, what the different features of raid are, then you could choose the proper raid to use. To the people who are using RAID, you’d better how raid works and how to maintain raid. In response to some reads’ request, we’ll write several article about raid. In this article, I’ll explain the basic knowledge about raid. What is raid? RAID is an acronym first defined by David A. Patterson, Garth A. Gibson, and Randy Katz at the University of California, Berkeley in 1987 to describe a redundant array of inexpensive disks, a technology that allowed computer users to achieve high levels of storage reliability from low-cost and less reliable PC-class disk-drive … Continue reading