RAID Arrays Overview

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Questions and Answers

What does RAID stand for?

Resilient Array of Inexpensive Disks

Rapid Arrangement of Independent Drives

Redundant Allocation of Important Data

Redundant Array of Independent Disks (correct)

What is a major characteristic of RAID 0?

It uses striping to improve performance. (correct)

It provides data mirroring for redundancy.

It stores all data on a single drive.

It requires a minimum of four drives.

What happens if one drive fails in a RAID 0 setup?

Data will be partially recoverable.

The array automatically rebuilds the lost data.

All data is retained on the remaining drives.

All data becomes unavailable. (correct)

How should RAID be viewed in terms of data management?

As a method for data storage enhancement. Signup and view all the answers

Which of the following RAID levels does NOT provide data redundancy?

RAID 0 Signup and view all the answers

What is a potential consequence of using RAID levels without redundancy?

Higher risks of total data loss. Signup and view all the answers

Which RAID configuration is specifically mentioned for improving performance?

RAID 0 Signup and view all the answers

Why is it crucial to choose the correct RAID level during setup?

Some levels offer no redundancy, leading to risks. Signup and view all the answers

What is the main characteristic of RAID 0?

It offers 0 redundancy. Signup and view all the answers

How does RAID 1 ensure data safety?

It mirrors data between two disks. Signup and view all the answers

What distinguishes RAID 5 from RAID 0?

RAID 5 includes parity information. Signup and view all the answers

What is a potential drawback of RAID 5 during data recovery?

It may cause a performance hit due to real-time calculations. Signup and view all the answers

What does RAID 10 combine?

Data striping and disk mirroring. Signup and view all the answers

What is a benefit of RAID 1 compared to RAID 0?

Data is accessible even if one disk fails. Signup and view all the answers

When might a user not realize a drive has failed in a RAID array?

If the user does not regularly monitor the array. Signup and view all the answers

What does RAID 5 use for efficient data storage?

Parity information on one additional drive. Signup and view all the answers

Which RAID configuration requires the most storage space?

RAID 1 Signup and view all the answers

Why might it be advantageous to spread parity information across different drives in RAID 5?

It minimizes performance issues during recovery. Signup and view all the answers

Study Notes

RAID Arrays Explained

RAID stands for Redundant Array of Independent (or Inexpensive) Disks. It's a way to maintain data availability if a drive fails, but it's not a backup method. It ensures ongoing access to data.

RAID Levels

Different RAID levels offer varying degrees of redundancy and performance.

RAID 0 (Striping)

Data is split evenly across multiple disks.
Provides performance benefits by allowing simultaneous reading/writing.
Zero redundancy: Data loss on any single disk means complete data loss.

RAID 1 (Mirroring)

Data is duplicated on multiple disks.
Each disk is an exact mirror image of the others.
Requires twice the disk space compared to RAID 0.
High redundancy: Data remains accessible if one disk fails.

RAID 5 (Striping with Parity)

Data is distributed across multiple disks.
Parity information is stored on a separate disk to enable data recovery if a disk fails.
More efficient than mirroring in terms of space usage.
High redundancy: Data recovery possible after a single disk failure, but real-time rebuilding might impact performance.

RAID 10 (Stripe of Mirrors)

Combines RAID 0 and RAID 1.
Data is striped across mirrored sets of disks.
Offers high redundancy and good performance.
High redundancy: Data accessible even with multiple simultaneous drive failures within mirror pair sets.

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Description

This quiz explains the various types of RAID arrays, including RAID 0, RAID 1, and RAID 5. Understand how each level provides different balances of performance and redundancy, and the implications for data security. Test your knowledge on the advantages and limitations of each RAID configuration.