RAID Types

Question 1

Define RAID

Answer 1

Redundant Array of Independent Disks

Question 2

RAID 0

Answer 2

Pro-
offers great performance

Get full disc size (2TB =2TB)

Con-
NO Fault Tolerance. If one drive goes bad, data is lost

(ex. Using two drives striping across all drives once)

Question 3

RAID 1

Answer 3

Pro -
Data stored twice by writing data to one set/half of drives, and writing the exact same data to the second set/half of drives and space

Fault tolerant! Can have a drive failure and replace with no loss of data

Con -
Disc Space cut in half (4TB=2TB)

Slower to write

(ex. 2 drives. drive 1 has identical data to drive 2)

Question 4

RAID 5

Answer 4

Parity bits pressed out over three drivesPro-
Striping With Parity
Read fast/write slower
Fault Tolerant

Most common secure RAID level.

Question 5

Two Kinds of RAID

Answer 5

Hardware RAID - own rack and circuit board (faster/more reliable)

Software RAID - OS does the hard work

Question 6

RAID 3

Answer 6

Parity

writes bit and bytes

Question 7

RAID 4

Answer 7

Parity

Writes blocks (works in SAN)

Question 8

RAID 10

Answer 8

Striping and Mirroring

Actually RAID 1 and RAID 0. Get the speed of striping and the redundancy of mirroring.

Question 9

RAID 15

Answer 9

Parity and Mirroring

RAID 1 and RAID 5