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<h2 id="history">History</h2> <p>Cloud computing is believed to have been invented by <a href="/facts/J._C._R._Licklider/QaL9FHPp">J. C. R. Licklider</a> in the 1960s with his work on <a href="/facts/ARPANET/LyMGWurJ">ARPANET</a> to connect people and data from anywhere at any time.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> </p><p>In 1983, <a href="/facts/CompuServe/Pjpdcf2a">CompuServe</a> offered its consumer users a small amount of disk space that could be used to store any files they chose to upload.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> </p><p>In 1994, <a href="/facts/AT%26T/y3Lo9uhk">AT&T</a> launched PersonaLink Services, an online platform for personal and business communication and entrepreneurship. The storage was one of the first to be all web-based, and referenced in their commercials as, "you can think of our electronic meeting place as the cloud."<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> <a href="/facts/Amazon_Web_Services/UFVN2796">Amazon Web Services</a> introduced their cloud storage service <a href="/facts/Amazon_S3/bqAXYCxq">Amazon S3</a> in 2006, and has gained widespread recognition and adoption as the storage supplier to popular services such as <a href="/facts/SmugMug/HacLQrsw">SmugMug</a>, <a href="/facts/Dropbox/7D2Rhh32">Dropbox</a>, and <a href="/facts/Pinterest/qAHQpuWN">Pinterest</a>. In 2005, <a href="/facts/Box_(company)/HGHEp6B5">Box</a> announced an online file sharing and personal cloud content management service for businesses.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> </p> <h2 id="architecture">Architecture</h2> <p>Cloud storage is based on highly virtualized infrastructure and is like broader <a href="/facts/Cloud_computing/guhg0FGV">cloud computing</a> in terms of interfaces, near-instant elasticity and <a href="/facts/Scalability/jh7JomPa">scalability</a>, <a href="/facts/Multi-tenancy/vAxVpeUu">multi-tenancy</a>, and <a href="/facts/Metered/gfkMHBNR">metered</a> resources. Cloud storage services can be used from an off-premises service (<a href="/facts/Amazon_S3/bqAXYCxq">Amazon S3</a>) or deployed on-premises (ViON Capacity Services).<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> </p><p>There are three types of cloud storage: a hosted <a href="/facts/Object_storage/NPHWJSW6">object storage</a> service, <a href="/facts/File_storage/FdPm90uc">file storage</a>, and <a href="/facts/Block_storage/S3vT7c6N">block storage</a>. Each of these cloud storage type offers its own unique advantages. </p><p>Examples of object storage services that can be hosted and deployed with cloud storage characteristics include <a href="/facts/Amazon_S3/bqAXYCxq">Amazon S3</a>, <a href="/facts/Oracle_Cloud/3VfYGGIB">Oracle Cloud Storage</a> and <a href="/facts/Microsoft_Azure/CCnIHTHd">Microsoft Azure</a> Storage, object storage software like <a href="/facts/OpenStack/bAfb8KVQ">Openstack Swift</a>, object storage systems like <a href="/facts/EMC_Atmos/eEXYgeQx">EMC Atmos</a>, EMC ECS and Hitachi Content Platform, and distributed storage research projects like OceanStore<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> and VISION Cloud.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> </p><p>Examples of file storage services include <a href="/facts/Amazon_Elastic_File_System/hHf1vkJY">Amazon Elastic File System</a> (EFS) and <a href="/facts/Qumulo/GQRQJRAF">Qumulo Core</a>,<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> used for applications that need access to shared files and require a file system. This storage is often supported with a <a href="/facts/Network_Attached_Storage/ABVjy8Tn">Network Attached Storage</a> (NAS) server, used for large content repositories, development environments, media stores, or user home directories. </p><p>A block storage service like <a href="/facts/Amazon_Elastic_Block_Store/jfVldYcN">Amazon Elastic Block Store</a> (EBS) is used for other enterprise applications like databases and often requires dedicated, low latency storage for each host. This is comparable in certain respects to <a href="/facts/Direct_attached_storage/fjGWBEUk">direct attached storage</a> (DAS) or a <a href="/facts/Storage_area_network/e7bmhrmB">storage area network</a> (SAN). </p><p>Cloud storage is:<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> </p> <ul><li>Made up of many distributed resources, but still acts as one, either in a <a href="/facts/Federation_(information_technology)/3SUojUub">federated</a><a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> or a <a href="/facts/Cooperative_storage_cloud/IpQdn3q8">cooperative storage cloud</a> architecture</li> <li>Highly fault tolerant through redundancy and distribution of data</li> <li>Highly durable through the creation of versioned copies</li> <li>Typically <a href="/facts/Eventual_consistency/Un19vCr0">eventually consistent</a> with regard to data replicas<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a></li></ul> <h2 id="advantages">Advantages</h2> <ul><li>Companies need only pay for the storage they actually use, typically an average of consumption during a month, quarter, or year.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> This does not mean that cloud storage is less expensive, only that it incurs operating expenses rather than capital expenses.</li> <li>Businesses using cloud storage can cut their energy consumption by up to 70% making them a more green business.<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a></li> <li>Organizations can choose between off-premises and on-premises cloud storage options, or a mixture of the two options, depending on relevant decision criteria that is complementary to initial direct cost savings potential; for instance, continuity of operations (COOP), disaster recovery (DR), security (PII, HIPAA, SARBOX, IA/CND), and records retention laws, regulations, and policies.<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a></li> <li>Storage availability and <a href="/facts/Data_protection/fb6DMpdN">data protection</a> are intrinsic to object storage architecture, so depending on the application, the additional technology, effort and cost to add availability and protection can be eliminated.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a></li> <li>Storage maintenance tasks, such as purchasing additional storage capacity, are offloaded to the responsibility of a service provider.<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a></li> <li>Cloud storage provides users with immediate access to a broad range of resources and applications hosted in the infrastructure of another organization via a web service interface.<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a></li> <li>Cloud storage can be used for copying <a href="/facts/Virtual_machine_image/wbVUwIeh">virtual machine images</a> from the cloud to on-premises locations or to import a virtual machine image from an on-premises location to the cloud image library. In addition, cloud storage can be used to move virtual machine images between user accounts or between data centers.<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a></li> <li>Cloud storage can be used as natural disaster proof backup, as normally there are 2 or 3 different backup servers located in different places around the globe.</li> <li>Cloud storage can be mapped as a local drive with the <a href="/facts/WebDAV/kwPgWnHD">WebDAV</a> protocol. It can function as a central file server for organizations with multiple office locations.</li></ul> <h2 id="potential-concerns">Potential concerns</h2> <h3>Data security</h3> <p class="note">See also: <a href="/facts/Cloud_computing_security/1cNtJakb">Cloud computing security</a></p> <p><a href="/facts/Outsourcing/qa3WgJ7u">Outsourcing</a> data storage increases the <a href="/facts/Attack_surface/KxF9Y8XK">attack surface area</a>.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a> </p> <ol><li>When data has been distributed it is stored at more locations increasing the risk of unauthorized physical access to the data. For example, in cloud based architecture, data is replicated and moved frequently so the risk of unauthorized data recovery increases dramatically. Such as in the case of disposal of old equipment, reuse of drives and reallocation of storage space. The manner in which that data is replicated depends on the service level a customer chooses and on the service provided. When encryption is in place it can ensure confidentiality. <a href="/facts/Crypto-shredding/8sgzShAE">Crypto-shredding</a> can be used when disposing of data (on a <a href="/facts/Disk_encryption/v7E50jGw">disk</a>).</li> <li>The number of people with access to the data who could be compromised (e.g., bribed, or coerced) increases dramatically. A single company might have a small team of administrators, network engineers, and technicians, but a cloud storage company will have many customers and thousands of servers, therefore a much larger team of technical staff with physical and electronic access to almost all of the data at the entire facility or perhaps the entire company.<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> Decryption keys that are kept by the service user, as opposed to the service provider, limit access to data by service provider employees. As for sharing multiple data in the cloud with multiple users, a large number of keys has to be distributed to users via secure channels for decryption, also it has to be securely stored and managed by the users in their devices. Storing these keys requires rather expensive secure storage. To overcome that, key-aggregate cryptosystem<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> can be used.</li> <li>It increases the number of networks over which the data travels. Instead of just a local area network (LAN) or storage area network (SAN), data stored on a cloud requires a WAN (wide area network) to connect them both.</li> <li>By sharing storage and networks with many other users/customers it is possible for other customers to access your data. Sometimes because of erroneous actions, faulty equipment, a bug and sometimes because of criminal intent. This risk applies to all types of storage and not only cloud storage. The risk of having data read during transmission can be mitigated through encryption technology. Encryption in transit protects data as it is being transmitted to and from the cloud service.<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a> Encryption at rest protects data that is stored at the service provider. Encrypting data in an on-premises cloud service on-ramp system can provide both kinds of encryption protection.</li></ol> <p>There are several options available to avoid security issues. One option is to use a private cloud instead of a public cloud. Another option is to ingest data in an encrypted format where the key is held within the on-premise infrastructure. To this end, access is often by use of on-premise <a href="/facts/Cloud_storage_gateway/94RXzkP1">cloud storage gateways</a> that have options to encrypt the data prior to transfer.<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> </p> <h3>Longevity</h3> <p class="note">See also: <a href="/facts/Financial_statement_analysis/I3cqYbLy">Financial statement analysis</a></p> <p>Companies are not permanent and the services and products they provide can change. Outsourcing data storage to another company needs careful investigation and nothing is ever certain. Contracts set in stone can be worthless when a company ceases to exist or its circumstances change. Companies can:<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a><a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a><a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> </p> <ol><li>Go bankrupt.</li> <li>Expand and change their focus.</li> <li>Be purchased by other larger companies.</li> <li>Be purchased by a company headquartered in or move to a country that negates compliance with <a href="/facts/Export_restrictions/XcfRXNKl">export restrictions</a> and thus necessitates a move.</li> <li>Suffer an irrecoverable disaster.</li></ol> <h3>Accessibility</h3> <ul><li>Performance for outsourced storage is likely to be lower than local storage, depending on how much a customer is willing to spend for WAN bandwidth<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a></li> <li>Reliability and availability depend on wide area network availability and on the level of precautions taken by the service provider. Reliability should be based on hardware as well as various algorithms used.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a></li></ul> <h3>Limitations of Service Level Agreements</h3> <p>Typically, cloud storage <a href="/facts/Service-level_agreement/lR2Gv0gv">Service Level Agreements</a> (SLAs) do not encompass all forms of service interruptions. Exclusions typically include planned maintenance, downtime resulting from external factors such as network issues, <a href="/facts/Human_error/DjcKhpy6">human errors</a> like misconfigurations, <a href="/facts/Natural_disaster/cCSK2uH0">natural disasters</a>, <a href="/facts/Force_majeure/TD2wx0X4">force majeure</a> events, or <a href="/facts/Data_breach/xGxRFY1A">security breaches</a>. Typically, customers bear the responsibility of monitoring SLA compliance and must file claims for any unmet SLAs within a designated timeframe. Customers should be aware of how deviations from SLAs are calculated, as these parameters may vary by other services offered within the same provider. These requirements can place a considerable burden on customers. Additionally, SLA percentages and conditions can differ across various services within the same provider, with some services lacking any SLA altogether. In cases of service interruptions due to hardware failures in the cloud provider, service providers typically do not offer monetary compensation. Instead, eligible users may receive credits as outlined in the corresponding SLA. <a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a><a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a><a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a><a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a> </p> <h3>Other concerns</h3> <ul><li>Security of <a href="/facts/Data_at_rest/H1DF7h8a">stored data</a> and <a href="/facts/Data_in_transit/8f1ztg6C">data in transit</a> may be a concern when storing sensitive data at a cloud storage provider<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a></li> <li>Users with specific records-keeping requirements, such as public agencies that must retain electronic records according to statute, may encounter complications with using cloud computing and storage. For instance, the U.S. Department of Defense designated the Defense Information Systems Agency (DISA) to maintain a list of records management products that meet all of the records retention, <a href="/facts/Personally_identifiable_information/384PbBg5">personally identifiable information</a> (PII), and security (Information Assurance; IA) requirements<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a></li> <li>Cloud storage is a rich resource for both hackers and national security agencies.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a><a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> Because the cloud holds data from many different users and organizations, hackers see it as a very valuable target.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a></li> <li>Piracy and copyright infringement may be enabled by sites that permit filesharing. For example, the CodexCloud ebook storage site has faced litigation from the owners of the intellectual property uploaded and shared there, as have the <a href="/facts/Grooveshark/He5WERsC">Grooveshark</a> and <a href="/facts/YouTube/db276jst">YouTube</a> sites it has been compared to.<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a><a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a></li> <li>The legal aspect, from a regulatory compliance standpoint, is of concern when storing files domestically and especially internationally.<a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a></li> <li>The resources used to produce large data centers, especially those needed to power them, are causing nations to drastically increase their energy production. This can lead to further climate damaging implications.</li></ul> <h2 id="hybrid-cloud-storage">Hybrid cloud storage</h2> <p class="note">Main article: <a href="/facts/Hybrid_cloud_storage/tRwq1fm5">Hybrid cloud storage</a></p> <p>Hybrid cloud storage is a term for a storage infrastructure that uses a combination of on-premises storage resources with cloud storage. The on-premises storage is usually managed by the organization, while the public cloud storage provider is responsible for the management and security of the data stored in the cloud.<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> Hybrid cloud storage can be implemented by an on-premises <a href="/facts/Cloud_storage_gateway/94RXzkP1">cloud storage gateway</a> that presents a file system or object storage interface that users can access in the same way they would access a local storage system. The cloud storage gateway transparently transfers the data to and from the cloud storage service, providing low latency access to the data through a local cache.<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a> </p><p>Hybrid cloud storage can be used to supplement an organization's internal storage resources, or it can be used as the primary storage infrastructure. In either case, hybrid cloud storage can provide organizations with greater flexibility and scalability than traditional on-premises storage infrastructure.<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a> </p><p>There are several benefits to using hybrid cloud storage, including the ability to <a href="/facts/Cache_(computing)/gmJYN8wm">cache</a> frequently used data on-site for quick access, while inactive <a href="/facts/Cold_data/tUjM8kNH">cold data</a> is stored off-site in the cloud. This can save space, reduce storage costs and improve performance. Additionally, hybrid cloud storage can provide organizations with greater redundancy and fault tolerance, as data is stored in both on-premises and cloud storage infrastructure.<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Block-level_storage/G5D4bKPd">Block-level storage</a></li> <li><a href="/facts/Cloud_collaboration/jzrhWpHK">Cloud collaboration</a></li> <li><a href="/facts/Cloud_Data_Management_Interface/K0wrdAys">Cloud Data Management Interface</a>, better known as CDMI</li> <li><a href="/facts/Cloud_database/mp7QWz5y">Cloud database</a></li> <li><a href="/facts/Comparison_of_online_backup_services/jtHfHd31">Comparison of online backup services</a></li> <li><a href="/facts/File_hosting_service/AWz9wQt8">File hosting service</a></li> <li><a href="/facts/Mobile_cloud_storage/3ak3SaK6">Mobile cloud storage</a></li> <li><a href="/facts/Cooperative_storage_cloud/IpQdn3q8">Cooperative storage cloud</a></li> <li><a href="/facts/Google_Cloud_Storage/UkHqfH2l">Google Cloud Storage</a></li> <li><a href="/facts/Cloud_computing/guhg0FGV">Cloud computing</a></li> <li><a href="/facts/Cooperative_storage_cloud/IpQdn3q8">Cooperative storage cloud</a></li> <li><a href="/facts/Fog_computing/XRrjRUKp">Fog computing</a></li> <li><a href="/facts/Edge_computing/4lqr8N6V">Edge computing</a></li> <li><a href="/facts/Mobile_edge_computing/5QSX1bXm">Mobile edge computing</a></li> <li><a href="/facts/Dew_computing/gMKoYIsT">Dew computing</a></li> <li><a href="/facts/Distributed_networking/lcSLct8y">Distributed networking</a></li> <li><a href="/facts/Data_cluster/zDruC5lW">Data cluster</a></li> <li><a href="/facts/Directory_(computing)/VLtLcEXY">Directory</a></li> <li><a href="/facts/File_system/FdPm90uc">File system</a></li> <li><a href="/facts/Clustered_file_system/Bz61f7Ce">Clustered file system</a></li> <li><a href="/facts/Distributed_file_system/Bz61f7Ce">Distributed file system</a></li> <li><a href="/facts/Distributed_file_system_for_cloud/gohq3Idj">Distributed file system for cloud</a></li> <li><a href="/facts/Distributed_data_store/Raz2puRl">Distributed data store</a></li> <li><a href="/facts/Distributed_database/A6Q1s4Iy">Distributed database</a></li> <li><a href="/facts/Cloud_research/CDfV1zop">Cloud research</a></li> <li><a href="/facts/In-memory_database/Am2VvJs4">In-memory database</a></li> <li><a href="/facts/In-memory_processing/Bu8WuNUA">In-memory processing</a></li> <li><a href="/facts/OneDrive/4Pty6BW8">OneDrive</a></li> <li><a href="/facts/Disk_aggregation/2jJaIF2I">Disk aggregation</a></li> <li><a href="/facts/Logical_disk/UDeELzFr">Logical disk</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Mohamed, Arif (9 April 2018). "A History of Cloud Computing". ComputerWeekly. <a href="http://www.computerweekly.com/Articles/2009/06/10/235429/A-history-of-cloud-computing.htm" target="_blank">http://www.computerweekly.com/Articles/2009/06/10/235429/A-history-of-cloud-computing.htm</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Louden, Bill (September 1983). "Increase Your 100's Storage with 128K from Compuserve". Portable 100. 1 (1). New England Publications Inc.: 22. ISSN 0738-7016. <a href="/wiki/ISSN_(identifier)" target="_blank">/wiki/ISSN_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Hernandez, Daniela (May 23, 2014). "Tech Time Warp of the Week". Wired. Archived from the original on 2020-09-21. Retrieved 2024-08-02. <a href="https://web.archive.org/web/20200921010826/https://www.wired.com/2014/05/tech-time-warp-cloud-is-born/" target="_blank">https://web.archive.org/web/20200921010826/https://www.wired.com/2014/05/tech-time-warp-cloud-is-born/</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Box.net lets you store, share, work in the computing cloud". Silicon Valley Business Journal. December 16, 2009. Retrieved October 2, 2016. <a href="http://www.bizjournals.com/sanjose/stories/2009/12/07/focus9.html" target="_blank">http://www.bizjournals.com/sanjose/stories/2009/12/07/focus9.html</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"On-premises private cloud storage description, characteristics, and options". Archived from the original on 2016-03-22. Retrieved 2012-12-10. <a href="https://web.archive.org/web/20160322022215/http://www.vion.com/capacity-services/vion-capacity-services.html" target="_blank">https://web.archive.org/web/20160322022215/http://www.vion.com/capacity-services/vion-capacity-services.html</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>S. Rhea, C. Wells, P. Eaton, D. Geels, B. Zhao, H. Weatherspoon, and J. Kubiatowicz, Maintenance-Free Global Data Storage. IEEE Internet Computing, Vol 5, No 5, September/October 2001, pp 40–49. [1] Archived 2012-03-29 at the Wayback Machine [2] Archived 2011-06-23 at the Wayback Machine <a href="http://oceanstore.cs.berkeley.edu/publications/papers/pdf/ieeeic.pdf" target="_blank">http://oceanstore.cs.berkeley.edu/publications/papers/pdf/ieeeic.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Kolodner, Elliot K.; Tal, Sivan; Kyriazis, Dimosthenis; Naor, Dalit; Allalouf, Miriam; Bonelli, Lucia; Brand, Per; Eckert, Albert; Elmroth, Erik; Gogouvitis, Spyridon V.; Harnik, Danny; Hernandez, Francisco; Jaeger, Michael C.; Bayuh Lakew, Ewnetu; Manuel Lopez, Jose; Lorenz, Mirko; Messina, Alberto; Shulman-Peleg, Alexandra; Talyansky, Roman; Voulodimos, Athanasios; Wolfsthal, Yaron (2011). "A Cloud Environment for Data-intensive Storage Services". 2011 IEEE Third International Conference on Cloud Computing Technology and Science. pp. 357–366. CiteSeerX 10.1.1.302.151. doi:10.1109/CloudCom.2011.55. ISBN 978-1-4673-0090-2. 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