SK0-003 · Question #294
A stripe set of maximum size is to be configured using two physical disks. One disk has 150GB and the other has 250GB in unallocated space. Which of the following will be the size of the stripe set?
The correct answer is B. 300GB. When creating a RAID 0 stripe set with disks of unequal sizes, the usable capacity is limited by the smallest disk's contribution multiplied by the number of disks.
Question
A stripe set of maximum size is to be configured using two physical disks. One disk has 150GB and the other has 250GB in unallocated space. Which of the following will be the size of the stripe set?
Options
- A150GB
- B300GB
- C400GB
- D500GB
How the community answered
(47 responses)- A6% (3)
- B89% (42)
- C2% (1)
- D2% (1)
Why each option
When creating a RAID 0 stripe set with disks of unequal sizes, the usable capacity is limited by the smallest disk's contribution multiplied by the number of disks.
150GB represents the size of the smallest disk, not the total combined capacity of the stripe set.
In a RAID 0 (stripe set) configuration, data is striped evenly across all disks. If disks have unequal sizes, each disk contributes the amount of space equal to the smallest disk. With a 150GB disk and a 250GB disk, each disk can contribute 150GB, resulting in a total stripe set size of 150GB + 150GB = 300GB.
400GB is the total raw sum of the unallocated space from both disks, but not the usable capacity for a RAID 0 configuration with unequal disk sizes.
500GB is an incorrect calculation and does not reflect the method of combining unequal disk sizes in a RAID 0 configuration.
Concept tested: RAID 0 capacity calculation with unequal disks
Source: https://www.dell.com/support/kbdoc/en-us/000137233/raid-levels-and-specifications
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