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:: ''Not to be confused with Galaxy S3'' Amazon S3 (Simple Storage Service) is an online file storage web service offered by Amazon Web Services. Amazon S3 provides storage through web services interfaces (REST, SOAP, and BitTorrent).〔(Amazon S3, Cloud Computing Storage for Files, Images, Videos ). Aws.amazon.com (2006-03-01). Retrieved on 2013-08-09.〕 Amazon launched S3, its first publicly available web service, in the United States in March 2006 and in Europe in November 2007. At its inception, Amazon charged end users US$0.15 per gigabyte-month, with additional charges for bandwidth used in sending and receiving data, and a per-request (get or put) charge. On November 1, 2008, pricing moved to tiers where end users storing more than 50 terabytes receive discounted pricing.〔(【引用サイトリンク】Amazon.com"> date = 2008-10-08 )〕 Amazon says that S3 uses the same scalable storage infrastructure that Amazon.com uses to run its own global e-commerce network.〔(The same data storage infrastructure that Amazon uses to run its own global network of web sites )〕 Amazon S3 is reported to store more than 2 trillion objects .〔(- Amazon S3 - Two Trillion Objects, 1.1 Million Requests / Second )〕 This is up from 102 billion objects ,〔(Brian Lillie of Equinix said that Amazon now is hosting 102 billion objects in S3 )〕 64 billion objects in August 2009,〔(S3 (Amazon's Simple Storage Service) alone has over 64 billion objects in it. )〕 52 billion in March 2009,〔(Just a year ago, there were 18 billion objects in S3. As of today there are 52 billion )〕 29 billion in October 2008,〔 14 billion in January 2008, and 10 billion in October 2007. S3 uses include web hosting, image hosting, and storage for backup systems. S3 guarantees 99.9% monthly uptime service-level agreement (SLA),〔(Amazon S3 SLA )〕 i.e. not more than 43 minutes of downtime per month.〔60 min/hour * 24 hours in a day * 30 days * 0.1% = 43.2〕 == Design == Details of S3's design are not made public by Amazon, though it clearly manages data with an object storage architecture. According to Amazon, S3's design aims to provide scalability, high availability, and low latency at commodity costs. S3 is designed to provide 99.999999999% durability and 99.99% availability of objects over a given year,〔(Amazon S3 Protecting Your Data )〕 though there is no service-level agreement for durability. S3 stores arbitrary objects (computer files) up to 5 terabytes in size, each accompanied by up to 2 kilobytes of metadata. Objects are organized into ''buckets'' (each owned by an Amazon Web Services account), and identified within each bucket by a unique, user-assigned key. Amazon Machine Images (AMIs) which are used in the Elastic Compute Cloud (EC2) can be exported to S3 as bundles.〔(Starting Websphere in Cloud and saving the data in S3 )〕 Buckets and objects can be created, listed, and retrieved using either a REST-style HTTP interface or a SOAP interface. Additionally, objects can be downloaded using the HTTP GET interface and the BitTorrent protocol. Requests are authorized using an access control list associated with each bucket and object. Bucket names and keys are chosen so that objects are addressable using HTTP URLs: * * * Because objects are accessible by unmodified HTTP clients, S3 can be used to replace significant existing (static) web hosting infrastructure.〔(How to use Amazon S3 for Web Hosting )〕 The Amazon AWS Authentication mechanism allows the bucket owner to create an authenticated URL with time-bounded validity. That is, someone can construct a URL that can be handed off to a third-party for access for a period such as the next 30 minutes, or the next 24 hours. Every item in a bucket can also be served up as a BitTorrent feed. The S3 store can act as a seed host for a torrent and any BitTorrent client can retrieve the file. This drastically reduces the bandwidth costs for the download of popular objects. While the use of BitTorrent does reduce bandwidth, AWS does not provide native bandwidth limiting and as such users have no access to automated cost control. This can lead to users on the 'free-tier' S3 or small hobby users amassing dramatic bills. AWS representatives have previously stated that such a feature was on the design table from 2006 to 2010〔(AWS Developer Forums: Limit my own bandwidth? ). Forums.aws.amazon.com. Retrieved on 2013-08-09.〕 but have recently stated the feature is no longer in development.〔(AWS Developer Forums: What is the status on the bill capping ). Forums.aws.amazon.com. Retrieved on 2013-08-09.〕 A bucket can be configured to save HTTP log information to a sibling bucket; this can be used in later data mining operations. This feature is currently still in beta. 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 S3」の詳細全文を読む スポンサード リンク
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