Exam 70-417 topic 1 question 316 discussion

You have a server named Served that runs Windows Server 2012 R2. You connect three new hard disks to Server 1.
You need to create a storage space that contains the three disks.
The solution must meet the following requirements:
✑ Provide fault tolerance if a single disk fails.
✑ Maximize the amount of useable storage space.
What should you create?

Suggested Answer: C 🗳️
Simple space does not provide fault tolerance, neither does spanned volumes, whereas parity & mirrored spaces do. So the question is parity space or mirrored space to maximize the amount of useable storage space? http://en.wikipedia.org/wiki/Spanned_volume
Unlike RAID, spanned volumes have no fault- tolerance, so if any disk fails, the data on the whole volume could be lost. http://arstechnica.com/information- technology/2012/10/storage-spaces-explained-a-greatfeaturewhen-itworks/
Storage Spaces explained: a great feature, when it works Three-way mirroring gives you less usable space than two-way mirroring, but can tolerate the failure of up to two disks at once.
Parity mirroring gives more usable space than either mirroring mode (a 20GB storage space configured with two-way mirroring will require about 40GB of physical disk space, but a 20GB parity storage space requires only about 30GB) but comes with the aforementioned performance hit.
References:
http://technet.microsoft.com/en-us/library/jj822938.aspx