Disk Redundancy

Question 1

In which four areas are you able to add redundancy in a system?

Answer 1

Disk redundancies, Server redundancies, Power redundancies, and Site redundancies

Question 2

How can you have disk redundancy?

Answer 2

Through RAID

Question 3

What is RAID 1?

Answer 3

Disk mirroring

Question 4

What is RAID 0?

Answer 4

Disk striping, provides NO redundancy

Question 5

What is RAID 5?

Answer 5

Disk striping + parity with three or more disks. Combines the redundancy of RAID 1 and 0. Allows 1 disk failure.

Question 6

What is RAID 6?

Answer 6

Extension of RAID 5, using 4 or more disks, plus an additional parity block, allowing 2 disk failures.

Question 7

What is RAID 10/Raid 1+0

Answer 7

Combines mirroring and striping. Variant called RAID 01.

Question 8

What are the advantages of using Hardware RAID?

Answer 8

Load is removed from the OS, and has better system performance. Often hot-swappable, amd can re-build arrays if a disk fails.