Overview of RAID

Click Here For Free Windows Downloads
mywindowsdownloads.blogspot.com

Click here for all Free Linux Downloads

mylinuxdownloads.blogspot.com

Blog address for Linux in Hindi

linuxinhindi.blogspot.com

RAID (Redundant Array of Independent Disks)

In RAID we combine multiple inexpensive disks in an array to get redundancy, which is not attainable with single large expensive disk। It is a way of connecting disks, in which the data is spread across multiple disks. If one disk fails, the other disks can take its functionality. There are several RAID versions where Linux can make use of other disk drives to reconstruct the lost data on any single failed disk. RAID provides three main advantages. These are:

Fault tolerance

We get fault tolerance in software RAID, if we configure each RAID partition of array on separate physical hard disk.

Failover

If the hard disk fails, RAID system can automatically transfer the data to the backup disk.

Hot swap

With hardware RAID and proper hardware we can change the faulty hard disk even if the computer system is in switched on state. Software RAID does not provide this feature.

Hardware RAID vs. Software RAID

There are two approaches for implementing RAID: Hardware RAID and Software RAID