3.3 RAID

Question 1

Redundant Array or Independent Disks (RAID)

Answer 1

Combination of multiple physical hard disks that is recognized by the operating system

Question 2

What are the RAID types?

Answer 2

RAID 0
RAID 1
RAID 5
RAID 6
RAID 10

Question 3

RAID 0

Answer 3

Is great for speed but provides no data redundancy (if you lose one disk, you lose the whole data). RAID 0 has no loss of space on the disks

Question 4

RAID 1

Answer 4

“Mirror” and “redundancy”. Uses 2 disks, both disks will have all files (they have identical copies). It provides full redundancy but has a downsize of losing disk space

Question 5

RAID 5

Answer 5

Gives redundancy through parity. Uses 3 or more disks. One of the most common RAID to use. Works by putting half of a file in one disk and the other half in a different disk, a parity between the two files is created and is stored in a different disk. You can lose 1 disk in RAID 5 and still keep operating

Question 6

RAID 6

Answer 6

Just think of 5 + 1. It’s the same as RAID 5 but it has double the parity. Needs a minimum of 4 disks. Can lose 2 disks and keep operating

Question 7

RAID 10 (one zero)

Answer 7

It’s a RAID of RAIDs. It has two RAID 1 that are placed inside a RAID 0 configuration. Takes up 4 disks, Loses half the space because it has 2 full redundant mirrors coming from the RAID