PrepAway - Latest Free Exam Questions & Answers

which of the following?

The MAIN issue with Level 1 of RAID is which of the following?

PrepAway - Latest Free Exam Questions & Answers

A.
It is very expensive.

B.
It is difficult to recover.

C.
It causes poor performance.

D.
It is relatively unreliable.

Explanation:
RAID Level 1 is commonly called mirroring. It mirrors the data from one disk or set of disks by duplicating the
data onto another disk or set of disks. This is often implemented by a one-for-one disk to disk ratio: Each drive
is mirrored to an equal drive partner that is continually being updated with current data. If one drive fails, the
system automatically gets the data from the other drive. The main issue with this level of RAID is that the onefor-one ratio is very expensive — resulting in the highest cost per megabyte of data capacity. This level
effectively doubles the amount of hard drives you need, therefore it is usually best for smaller capacity systems.
Incorrect Answers:
B: RAID level 1 is not difficult to recover. If one drive fails, the system automatically gets the data from the other
drive.
C: RAID level 1 does not cause poor performance. The performance is quite good because no parity data
needs to be calculated.
D: RAID level 1 is not relatively unreliable; duplicating data onto another disk is a reliable system.

Krutz, Ronald L. and Russell Dean Vines, The CISSP Prep Guide: Mastering the CISSP and ISSEP Exams,
2nd Edition, Wiley Publishing, Indianapolis, 2004, p. 144


Leave a Reply