Core 1 - RAID arrays

Question 1

Minimum 2 disks.
Excellent performance ( as blocks are striped ).
No redundancy ( no mirror, no parity ).
Not recommended for any critical system.

Answer 1

RAID 0

Question 2

Minimum 2 disks.
Good performance ( no striping. no parity ).
Excellent redundancy ( as blocks are mirrored ).

Answer 2

RAID 1

Question 3

Minimum 3 disks.
Good performance ( as blocks are striped ).
Good redundancy ( distributed parity ).
Best cost effective option providing both performance and redundancy. Use this for DB that is heavily read oriented. Write operations will be slow.

Answer 3

RAID 5

Question 4

Minimum 4 disks.
This is also called as “stripe of mirrors”
Excellent redundancy ( as blocks are mirrored )
Excellent performance ( as blocks are striped )
If you can afford the dollar, this is the BEST option for any mission critical applications (especially databases).

Answer 4

RAID 10

Question 5

what does RAID stand for?

Answer 5

Redundant Array of Inexpensive (Independent) Disks