Disk Preparation and RAID Types

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary purpose of Disk Preparation in the system installation process?

To implement RAID array

To create a partition for system installation (correct)

To provide fault tolerance to the system

To increase performance of the system

What does RAID stand for?

Rapid Access of Integrated Disks

Reliable Array of Integrated Devices

Redundant Array of Independent Drives (correct)

Random Access of Independent Devices

What is the primary advantage of RAID 0?

Increased data security

Faster data access (correct)

Fault tolerance

Reduced cost of storage

What is the limitation of RAID 1?

Double the cost of a single drive Signup and view all the answers

What is the characteristic of RAID 1?

Data is written simultaneously to two separate drives Signup and view all the answers

What is the common feature of RAID 2 and RAID 3?

Both are rarely used in practice Signup and view all the answers

What is a characteristic of RAID 3?

It cannot service multiple requests simultaneously Signup and view all the answers

What is an advantage of RAID 4?

It can be quickly extended online without parity recomputation Signup and view all the answers

What is the minimum number of drives required for RAID 5?

Three Signup and view all the answers

What is the purpose of the parity block in RAID 5?

To provide redundancy in case of drive failure Signup and view all the answers

What is RAID 6 also known as?

Striping with double parity Signup and view all the answers

What is a benefit of RAID 6 compared to RAID 5?

It is more secure than RAID 5 Signup and view all the answers

What is the main advantage of combining RAID 0 and RAID 1 in a single system?

To provide security by mirroring all data Signup and view all the answers

What happens when a disk fails in a RAID 10 configuration?

The rebuild time is very fast Signup and view all the answers

What percentage of storage capacity is lost due to mirroring in a RAID 10 configuration?

50% Signup and view all the answers

What is the time taken to rebuild a 1 TB drive in a RAID 10 configuration?

30 minutes Signup and view all the answers

Which RAID type is also known as mirroring?

RAID 1 Signup and view all the answers

Study Notes

RAID Types

RAID stands for Redundant Array of Independent Disks, combining storage power of multiple hard disks for increased performance or fault tolerance.

RAID 0

Also known as disk striping, doesn't provide fault tolerance.
Data is written across multiple drives, allowing one drive to read or write while the next drive's read/write head is moving.
Provides faster data access, but has no fault tolerance.
Usable space in the drive is equal to the total space on all the drives.

RAID 1

Also known as disk mirroring, provides fault tolerance by writing all data simultaneously to two separate drives.
Doesn't help access speed, and the cost is double that of a single drive.
Only one half of the total drive space is available for data.

RAID 2

Rarely used in practice, stripes data at the bit level, and uses a Hamming code for error correction.

RAID 3

Rarely used in practice, consists of byte-level striping with a dedicated parity disk.
Generally cannot service multiple requests simultaneously.

RAID 4

Consists of block-level striping with a dedicated parity disk.
Provides good performance of random reads, but low performance of random writes.
Can be quickly extended online without parity recomputation, as long as newly added disks are completely filled with 0-bytes.

RAID 5

Combines the benefits of RAID 0 and RAID 1, known as striping with parity.
Requires a minimum of three drives.
Uses 1/n (n = number of drives in the array) for parity information, and 1 – (1/n) is available for data.

RAID 6

Also known as striping with double parity, requires a minimum of four drives.
Can withstand two drives dying simultaneously, providing higher security than RAID 5.
Like RAID 5, read data transactions are very fast, and can still access data even with two failed drives.

RAID 10

Combines the advantages (and disadvantages) of RAID 1 and RAID 0.
Provides security by mirroring all data on secondary drives, while using striping across each set of drives to speed up data transfers.
Rebuild time is very fast, but is an expensive way to have redundancy.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Learn about the process of preparing a disk for system installation, including formatting and partitioning, as well as the different types of RAID configurations for improved performance and fault tolerance. Understand the benefits and limitations of RAID arrays and how to set them up.