RAID (Redundant Array of Independent Disks) is a data storage virtualization technology that combines physical disk drives into a single logical unit. It provides data redundancy, improves performance and availability. There are three main types discussed: RAID 0 uses striping for improved performance but no redundancy; RAID 1 uses mirroring to provide redundancy by copying data between disks; RAID 5 uses striping with parity, dedicating 25% of disk space for parity bits to allow recovery if a single disk fails. The document concludes by instructing the reader to move to a virtual machine environment to practice RAID concepts practically.

1. System And Networks Administrator
RAID(Redundant array of independent disks)
Presented by
Sir Shafaan Khaliq
Lecturer in UOS (Mianwali Campus)
BSIT(5th) UOS (Mianwali

2.  RAID is a data storage virtualization technology that
combines multiple physical disk drive components into a
single logical unit.
 System consists of two or more drives working in parallel
 Data redundancy, Improve performance & availability.
.
2

3. 3
Types
Three types we discussed are as follows:
•RAID 0
•RAID1
•RAID 5

4. 4
RAID 0
 Two disks minimum required.
 (Striping) disks are grouped together to form one large
drive.
 If any single disk in the RAID fail, the entire set of disks
becomes unusable.

5. 5
RAID 1
 Two disks minimum required.
 (Mirroring) disks are copied from one to another, allowing for
redundancy.
 Should one disk fail, the other disk takes over, having an exact
copy of data from the original disk.

6. 6
RAID 5
 Three disks minimum required.
 (Striping with parity) disks are similar to RAID 0 and are
join together to form one large drive.
 The difference here is that 25%
of the disk is used for a parity bit, which allows the
disks to be recovered should a single disk fail.

7. 7
Now move to Virtual Machine
and
make it practically
(by using rhel-server-6.1-i386)

8. 8
End