RAID is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

1. Md. Talath Un Nabi
ID: 200101076

2. RAID Definition
RAID is a data storage
virtualization technology that
combines multiple physical
disk drive components into
one or more logical units for
the purposes of data
redundancy, performance
improvement, or both.

3. Why we use RAID?
RAID allows you to weather the failure of one or more drives without data
loss and, in many cases, without any downtime. RAID is also useful if you
are having disk IO issues, where applications are waiting on the disk to
perform tasks.

4. RAID
Advantages
Fault Tolerance.
Higher Data Security.
Increase the parity check for any possible system crash.
Reading and Writing of data done at simultaneously.
Improved Availability and performance.
Ensures data reliability.

5. RAID Limitations
▪ Write speed reduced compared to single drives.
▪ The storage capacity of the individual hard drives is
somewhat limited.

6. Types of RAID
RAID 0
1
RAID 1
2
RAID 2
3
RAID 3
4
RAID 4
5
RAID 5
6
RAID 6
7
RAID 7
8

7. RAID 0
The main advantage of RAID 0 and disk striping is improved performance.
RAID 0 is an abbreviation of the
Redundant Array of Independent Disk
level 0. Raid 0 is also called striped
volume or stripe set or disk striping. Raid
0 is a standard level, which does not
consist of mirroring or parity, but only
consists of striping for handling the data.

8. RAID 1
Disk mirroring, also known as RAID 1, is
the replication of data to two or more
disks. Disk mirroring is a good choice
for applications that require high
performance and high availability, such
as transactional applications, email
and operating systems.
▪ Increased read performance.
▪ Provides redundancy and fault tolerance.
▪ Simple to configure and easy to use.

9. RAID 2
RAID 2 is another RAID standard level
configuration that provides very high
data transfer rates. In RAID 2, a
central controller synchronizes the
disks by making them spin at the same
angular orientation so that they all
reach the index simultaneously.
▪ Reliability.
▪ The ability to correct stored information.

10. RAID 3
RAID 3 is a RAID configuration that us e s a
parity disk to store the information
generated by a RAID controller instead of
striping it with the data. Because the parity
information is on a separate disk, RAID 3
does not perform well when tasked with
numerous small data requests.
▪ Good throughput when transferring large
amounts of data.
▪ High efficiency with sequential operations.

11. RAID 4
RAID 4 is a RAID configuration that uses a
dedicated parity disk and block-level
striping across multiple disks. Because
data is striped in RAID 4, the records can
be read from any disk. However, since all
the writes must go to the dedicated parity
disk, this causes a performance bottleneck
for all write operations.
▪ Fast read operations
▪ Low storage overhead.
▪ Simultaneous I/O requests.

12. RAID 5
RAID 5 is a redundant array of independent
disks configuration that uses disk striping
with parity. Because data and parity are
striped evenly across all of the disks, no single
disk is a bottleneck. Striping also allows users
to reconstruct data in case of a disk failure.
▪ High performance and capacity.
▪ Fast and reliable read speed.
▪ Tolerates single drive failure

13. RAID 6
RAID 6, also known as double- parity RAID
(redundant array of independent disks), is
one of several RAID schemes that work by
placing data on multiple disks and
allowing input/output (I/O) operations to
overlap in a balanced way, improving
performance. Not all types of R AID offer
redundancy, although RAID 6 does.
▪ High fault and drive-failure tolerance.
▪ Storage efficiency (when more than four drives are used).
▪ Fast read operations.

14. RAID 7
RAID 7 is a type of RAID level that includes a
real-time embedded operating system and
processor for enhanced data read/write or
I/O operations and data caching capabilities.
It is a propriety RAID level owned by Storage
Computer Corporation.
▪ Large Storage. To begin with, one of the most
obvious benefits is that a RAID has far more storage
capacity than a single drive.
▪ Fault Tolerance. Data backup in the array is created
automatically in most RAID levels.

15. CONCLUSION
RAID is an effective mass storage scheme for
improving speeds for streaming application
purposes and increasing redundancy to ensure
data safety. RAID 0 is best suited for
applications that require high-speed data
streaming.RAID is extremelyuseful if uptime
and availability are important to you or your
business. Backups will help insure you from a
catastrophicdata loss. But, restoring large
amounts of data, like when you experience a
drive failure,can take many hours to perform.