3.3 – RAID 5

Question 1

RAID 5

Answer 1

–Uses disk striping to combine drives into one larger & faster logical drive & distributes parity across all disks in the array

good speed

lose a drive OK,

good redundancy,

lose a drive: slow
—Great for WORKSTATION or SERVER

Question 2

RAID 5

Parity Data

Answer 2

is a smaller representative value that can be used to recreate data if data is lost

–Writes parity onto 1 disk while writing every cycle
–Data – Data – Parity
–Parity – Data – Data
–Data – Parity – Data

Question 3

RAID 5

Advantages

Answer 3

-Data protection
–If 1 disk fails, parity will be used to recreate data
–Larger storage that a single drive

Question 4

RAID 5

Disadvantages

Answer 4

–3 disks required but more disks increase capacity NOT protection / performance

–Parity is SLOW
—Working while a disk has failed = slow
—Rebuilding the array is slow when replacing a degraded disk