RAID

Question 1

2+ Disks
Data is written to both disks at once. This increases speed but there is no fault tolerance. If one drive fails. the entire RAID fails.

Answer 1

RAID 0
Striping

Redundant Array of Independent Disks

Question 2

2+ Disks
Data is written to one disk and then mirrored (if using the same disk controller) or duplexed (if using a different disk controller) to another disk. If a single drive fails, the mirror takes over until another hard drive is installed, thus restoring the RAID.

Answer 2

RAID 1
Mirroring or Duplexing

Redundant Array of Independent Disks

Question 3

3+ Disks
Data is striped to two disks and then a parity bit is stored on a third disk. this parity bit will restore data on either disk should a disk fail.

Answer 3

RAID 5
Striping with parity

Redundant Array of Independent Disks

Question 4

4+ Disks

Data is striped to two Disks (as in Raid 0) and then mirrored to another set of two disks (as in a RAID 1).

Answer 4

RAID 10 (1+0)

Redundant Array of Independent Disks