An application needs 10GB of RAID 1 for log files, 20GB of RAID 5 for data files, and 20GB of RAID 5 for the operating system. All disks will be 10GB in capacity. Which of the following is the minimum number of disks needed for this application?
C is not correct, it does not specify that the 2x 20gb of Raid5 need to be on separate arrays so it is 2 disk for the raid1 = 10gb and 5 disk of raid5 = 40gb.
I think you're right, and I think this is a crap question only meant to screw with people. By separating the two, OS and data in the question, most people will think it makes sense to use two different RAIDs, which, quite frankly, it does, especially if the only difference in cost is 1x10GB drive.
To calculate the minimum number of disks needed for the given RAID configurations, let's break down each requirement:
RAID 1 for log files: This requires mirroring, so each disk contributes half of its capacity. Since we need a total of 10GB usable space, we'll need 20GB raw capacity (10GB mirrored). Thus, we need 20GB / 10GB = 2 disks.
RAID 5 for data files (20GB): RAID 5 requires at least three disks, and one disk worth of capacity is used for parity. So, for 20GB of usable space, we'll need 3 disks.
RAID 5 for the operating system (20GB): Same as the data files, we'll need 3 disks for 20GB of usable space.
Adding these up:
RAID 1 (log files): 2 disks
RAID 5 (data files): 3 disks
RAID 5 (operating system): 3 disks
Total disks needed: 2 + 3 + 3 = 8 disks.
So, the correct answer is:
C. 8
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