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Amazon Glacier is an online file storage web service that provides storage for data archiving and backup. Glacier is part of the Amazon Web Services suite of cloud computing services, and is designed for long-term storage of data that is infrequently accessed and for which retrieval latency times of 3 to 5 hours are acceptable. Storage costs are a consistent $0.007 per gigabyte per month, which is substantially cheaper than Amazon's own Simple Storage Service (S3) service. Amazon hopes this new service will move businesses from on-premises tape backup drives to cloud-based backup storage. ==Storage== ZDNet says, that according to private e-mail, Glacier runs on "inexpensive commodity hardware components".〔 In 2012, ZDNet quoted a former Amazon employee as saying that Glacier is based on custom low-RPM hard drives attached to custom logic boards where only a percentage of a rack's drives can be spun at full speed at any one time. (Similar technology is also used by Facebook.)〔http://arstechnica.com/information-technology/2015/11/to-go-green-facebook-puts-petabytes-of-cat-pics-on-ice-and-likes-windfarming/〕 There is some belief amongst users that the underlying hardware used for Glacier storage is tape-based, owing to the fact that Amazon has positioned Glacier as a direct competitor to tape backup services (both on-premises and cloud-based). This confusion is exacerbated by the fact that Glacier has archive retrieval delays (3–5 hours before archives are available) similar to that of tape-based systems and a pricing model that discourages frequent data retrieval. ''The Register'' claimed that Glacier runs on Spectra T-Finity tape libraries with LTO-6 tapes.〔(【引用サイトリンク】title=Insider 'fesses up: Amazon's Glacier cloud is made of ... TAPE )〕〔(【引用サイトリンク】title=Spectra: Tape is dead? We installed 550PB of the stuff in 6 months )〕 Others have conjectured Amazon using off-line shingled magnetic recording hard drives, multi-layer Blu-ray optical discs, or an alternative proprietary storage technology. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Amazon Glacier」の詳細全文を読む スポンサード リンク
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