A systems engineer has been presented with storage performance and redundancy requirements for a
new system to be built for the company. The storage solution must be designed to support the highest
performance and must also be able to support more than one drive failure. Which of the following should
the engineer choose to meet these requirements?

A.
A mirrored striped array with parity

B.
A mirrored mirror array

C.
A striped array

D.
A striped array with parity

Explanation:
Mirroring means the data written to one drive is exactly duplicated to a second drive in real time. Disk
mirroring is also known as RAID 1 and the data is intact in a RAID 1 array if either one of the two drives
fails. After the failed drive is replaced with a new drive, you remirror the data from the good drive to the
new drive to re-create the array.
Incorrect Answers:
A: A mirrored striped array with parity is not going to meet the stated requirements.
C: Disk striping means making use of multiple drives as a single volume.
D: Disk striping with parity means that three or more drives are used in unison, and one drive’s worth of
space is consumed with parity information.

Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, p. 142
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 34-35