試験CISSP-JP トピック1 問題1135 スレッド

Deduplication is a technique of eliminating redundant or duplicate data from a storage system, such as a storage area network (SAN). Deduplication can reduce the amount of storage space required, improve the performance and efficiency of the storage system, and lower the cost and complexity of data management.
Deduplication can be performed at different levels, such as file-level, block-level, or byte-level, and at different locations, such as source-side, target-side, or inline. Compression is a technique of reducing the size of data by using algorithms that remove or replace unnecessary or repetitive bits or symbols. Compression can also reduce the amount of storage space required, but it may not be as effective as deduplication in eliminating redundant or unusable data. Replication is a technique of creating and maintaining copies of data across multiple storage devices or locations, such as disks, servers, or sites. Replication can improve the availability, reliability, and accessibility of data, but it does not reduce the amount of storage space required. In fact, replication can increase the amount of storage space required, as well as the network bandwidth and the complexity of data synchronization. Caching is a technique of storing frequently accessed or recently used data in a fast and temporary storage device or location, such as memory, disk, or server. Caching can improve the performance and responsiveness of the storage system, but it does not reduce the amount of storage space required. Caching only stores a subset of the data, and it does not eliminate redundant or unusable data. References: [CISSP CBK Reference, 5th Edition, Chapter 3, page 153]; [CISSP All-in-One Exam Guide,
8th Edition, Chapter 3, page 121]