Exam 70-697 topic 10 question 21 discussion

Actual exam question from Microsoft's 70-697

Question #: 21
Topic #: 10

You have a Windows 8.1 Enterprise client computer named Computer1. The Storage Spaces settings of Computer1 are configured as shown in the following exhibit. (Click the Exhibit button.)

You plan to create a three-way mirror storage space in the storage pool and to set the size of the storage space to 50 GB.
You need to identify the minimum number of disks that must be added to the storage pool for the planned mirror.
How many disks should you identify?

A. 1
B. 3
C. 4
D. 5

Show Suggested Answer

Suggested Answer: B 🗳️
In Windows Server 2012 Storage Spaces and Windows 8Storage Spaces, a 2-way mirror requires at least 2 physical disks.
However, a 3-way mirror requires at least 5 physical disks.
The reason is that a 3-way mirror uses a quorum. In order to keep running, the mirror space must keep over 50% of the disks functioning.
So a 3-way mirror must have at least 5 physical disks to be able to survive the loss of up to 2 physical disks.
References: https://www.technorms.com/21529/windows-8-storage-spaces

by KG0161093 at June 29, 2021, 2:50 p.m.

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KG0161093

3 years, 11 months ago

Answer is D The three-way mirror storage layout can only be created on no less than five physical drives. In such a space there are three copies of each slab stored on different pool member disks

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