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| Active Archive ： ウィキペディア英語版 |
Active Archive
Active Archive is a method of tiered storage which gives the user access to data across a virtualized file system that migrates data between multiple storage systems and media types including solid-state drive/flash, hard disk drives, magnetic tape, optical disk, and cloud. The result of an active archive implementation is that data can be stored on the most appropriate media type for the given retention and restoration requirements of that data. This allows less time sensitive or infrequently accessed data to be stored on less expensive media, and eliminates the need for an administrator to manually migrate data between storage systems. Additionally since storage systems such as tape libraries have very low power consumption, the operational expense of storing data in an active archive is greatly reduced.
Active archives provide organizations with a persistent view of the data in their archives and make it easy to access files whenever needed. Active archives take advantage of metadata in order to keep track of where primary, secondary, and sometimes tertiary copies of data reside within the system, in order to maintain online to near-online accessibility to any given file in a file system, regardless of the storage medium being utilized. The impetus for active archive applications, or the software involved in an active archive, was the growing amount of unstructured data in the typical data center and the need to be able to manage and efficiently store that data. As a result, active archive applications tend to be focused on file systems and unstructured data, rather than all of the collective data; however, many have features and functions that address traditional backup needs as well.
Active archives provide online access, searchability and retrieval to long-term data and enable virtually unlimited scalability to accommodate future growth. In addition, active archives enhance the business value of the data by enabling users to directly access the data online, search it and use it for their business purposes.
==Performance==
Since an active archive is built around a cost-performance ratio, the performance standards of these systems vary significantly based on each individual implementation.〔 Within an active archive the quantities and types of media used are determined by the retention and access requirements of the varying types of data. This gives a company the flexibility to determine their own tolerance levels for accessing any given type of data. However, in general, active archive systems can recall data to a use ranging from milliseconds to 2 minutes, depending on what type of media the data is residing.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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