What is the usable disk space of a RAID 5 array of five 18GB drives with one drive
dedicated as a spare?
A.
18GB
B.
36GB
C.
54GB
D.
72GB
E.
90GB
Explanation:
What is the usable disk space of a RAID 5 array of five 18GB drives with one drive dedicated as a spare?
What is the usable disk space of a RAID 5 array of five 18GB drives with one drive
dedicated as a spare?
C.
RAID5 uses one disk for Parity and requires at least three drives to be used.
3*18GB=54GB
The question asked “RAID 5 array of five 18GB drives”
5 * 18 = 90GB
question is about usable space, you have 5 disks, one for spare and one for parity
5-1-1=3 drives
3*18GB=54GB
54GB is a good answer
Isn’t there only one disk needed for parity? Means, only one of five disks does not count as disk space?