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70-687 Configuring Windows 8.1 – sample exam – Q82

A company has client computers that run Windows 8.1. Each computer has two hard drives.
You need to create a dynamic volume on each computer to support the following features:
■ Fault tolerance
■ Fast write performance
What kind of dynamic volume should you create?

A. Striped volume
B. Spanned volume
C. RAID 5 volume
D. Mirrored volume

Correct Answer: D What Are Dynamic Disks and Volumes?
Types of Dynamic Volumes
A dynamic volume is a volume that is created on a dynamic disk. Dynamic volume types include simple, spanned, and striped volumes.

Mirrored Volumes
A mirrored volume is a fault-tolerant volume that provides a copy of a volume on another disk. Mirrored volumes provide data redundancy by duplicating the information contained on the volume. The two disks that make up a mirrored volume are known as mirrors. Each mirror is always located on a different disk. If one of the disks fails, the data on the failed disk becomes unavailable, but the system continues to oper- ate by using the unaffected disk.
Mirrored volumes are typically created by the user who requires fault-tolerance and who has two disks in their computer. If one disk fails, the user always has a copy of their data on the second disk. Mirrored vol- umes provide better write performance than RAID-5 volumes.

Further Information:

Striped Volumes
Striped volumes improve disk input/output (I/O) performance by distributing I/O requests across disks. Striped volumes are composed of stripes of data of equal size written across each disk in the volume. They are created from equally sized, unallocated areas on two or more disks. Striped volumes cannot be extended or mirrored and do not offer fault tolerance. If one of the disks con- taining a striped volume fails, the entire volume fails, and all data on the striped volume becomes inacces- sible. The reliability for the striped volume is less than the least reliable disk in the set.

RAID-5 Volumes
A RAID-5 volume is a fault-tolerant volume that stripes data and parity across three or more disks. Parity is a calculated value that is used to reconstruct data if one disk fails. RAID-5 volumes are typically created by the user who requires fault-tolerance and who has at least three disks in their computer. If one of the disks in the RAID-5 volume fails, the data on the remaining disks, along with the parity information, can be used to recover the lost data. RAID-5 volumes are well-suited to storing data that will need to be read frequently but written to less frequently. Database applications that read randomly work well with the built-in load balancing of a RAID-5 volume.

Spanned Volumes
Spanned volumes combine areas of unallocated space from multiple disks into one logical volume. The areas of unallocated space can be different sizes. Spanned volumes require two disks, and you can use up to 32 disks.

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