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TR2 > RAID > Flashcards

RAID Flashcards

1
Q

What is RAID, and what are some of its benefits?

A

RAID-Redundant Array of inexpensive or independent disks. It is a storage technology that provides more security against hard disk failure

BENEFITS:
i. Fault Tolerance
ii. Higher data security
iii. Ensure data reliability
iv. ImprovedPerformance

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2
Q

What are the differences between RAID and LVM?

A

RAID is used at the hardware level. It aims to improve redundancy. Whereas LVM is used at the OS level. It aims to improve data management.

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3
Q

Why do different RAID levels exist?

A

We have RAID levels 0,1,5,6,1-0 (10). Each provides different benefits, features, cost, performance, and redundancy. Which level we use depends on our objectives.

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4
Q

What are the key considerations for choosing a specific RAID level?

A

cost, performance, redundancy

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5
Q

How does RAID 0 differ from RAID 1?

A

RAID 0 offers striping means the data split evenly between two or more disks. In RAID 0 data is not recoverable. It is used when data reliability is less concerned, and speed is crucial.

RAID 1 offers redundancy through mirroring. Two disks contain similar data. Therefore, in RAID 1 data can be recovered

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6
Q

What distinguishes RAID 5 from RAID 6?

A

RAID 5 has striping with parity. There is minimum 3 hard disks required. If one disk fails, you can still recover your data. If two disks fail with parity, it will lose the data.

RAID 6 has striping with double parity, minimum number of required hard disks is 4. You can lose up to 2 disks without losing the data.

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7
Q

What are the advantages of using parity in RAID?

A

Parity is an algorithm that allows restoration should 1 disk fail in RAID 5, or should 2 disks fail in RAID 6.

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8
Q

How many disks can RAID 6 lose without data loss?

A

2

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9
Q

What is the minimum number of disks required to configure RAID 5 and RAID 6?

A

3 disks for RAID 5, 4 disks for RAID 6.

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10
Q

Can you explain RAID 10?

A

RAID 1+0 (10): A combination of RAID 1 (mirroring) and RAID 0 (striping). This uses 4 disks, provides better reading and writing performance, as well as redundancy.

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11
Q

If cost is a primary consideration and you can choose any single RAID level, which one would you select?

A

RAID 0

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12
Q

If you only need improved reading performance, which RAID level would you choose?

A

RAID 1

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13
Q

Is RAID 6 slower than RAID 5, and why does it exhibit slower performance? Please provide an explanation

A

More to write in double parity slows down speeds

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TR2 (12 decks)

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