![]() ![]() ![]() The retrieved content is retained in the cache for as long as it is needed or until it is retired as an effect of the application of relevant data retention policies. Clients may then access the data at high speeds and possibly in parallel. As the tape library or optical jukebox cannot handle a large number of concurrent requests (there is only a limited number of tape or optical drives which operate at nominal data rates per device), the archive contents are typically copied to a data cache, for example a regular NAS server. ![]() To fulfill a client access request, a separate database that maintains the catalogue of archive contents must be consulted. A tertiary storage platform may be perceived as a specialized type of NAS that uses additional robotic mechanisms to transfer media between their long-term storage locations and available drives without human intervention. The removable media are normally not stored in suitable drives but held in specially arranged retention slots, shelves, or carousels in an offline state. Tertiary storage comprises high-capacity data archives designed to incorporate vast numbers of removable media, such as tapes or optical discs. ![]()
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