Storage Virtualization

Correct Answer: Disk striping

Disk striping indeed can enhance the performance of a storage virtualization environment. This technique spreads out blocks of each file across multiple disk drives, allowing the processing of I/O requests more concurrently, and thus, boosts the performance significantly. The other techniques mentioned, though relevant to storage management, do not specifically cater to the performance enhancement as asked in the question. Data deduplication does help in improving storage efficiency by eliminating redundant data, but it does not contribute directly to performance improvement. A Snapshot is a state of a system at a particular point in time, it cannot distribute I/O requests thus it does not help in improving performance. Storage tiering refers to the assignment of different categories of data to different types of storage media with the objective to reduce total storage cost. It does not impact the I/O performance.

Correct Answer: Thin provisioning

Thin provisioning is a method of storage resource management and virtualization technology that offers efficiency and agility. It enables the allocation of disk storage space in a flexible way among multiple users. It allows to give out more storage space than currently available, thus benefitting in future storage expansion without altering existing infrastructure. As for the other options: - Synchronous mirroring is a data protection method that reflects changes over primary data to the secondary data instantly. It doesn't directly allow for easy storage expansion without modifying infrastructure. - Disk striping is a method of concatenating multiple drives into one logical storage unit. It can improve performance, but it does not provide the ability to easily expand storage without altering existing infrastructure. - Data deduplication refers to the elimination of redundant data. Every unique piece of data is stored only once. Although it does help in saving storage space, it doesn't facilitate easy expansion of storage space.

Correct Answer: Data deduplication

The best technique to reduce duplicate data and optimize storage utilization is Data deduplication. This technique identifies and eliminates redundant data, keeping only one copy and replacing the rest with pointers to the original, thus significantly saving storage space and improving overall performance. Synchronous mirroring, while it ensures data availability and integrity, doubles the storage requirements as the same data is mirrored in real-time to two different locations. Disk striping, on the other hand, helps improve performance by spreading data across multiple disks but does not directly address the issue of duplicate data. Finally, Thin provisioning on its own does not eliminate duplicate data but merely allocates storage as needed, which might mitigate some storage costs but does not solve the root cause of duplicate data.