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/* Cloud computing comparison of different vendors */
One of the most talked about topic today is the Cloud Computing – the new phenomenon set to change the way we use computers forever. Cloud computing refers to the delivery of software and other technology services over the Internet by a service provider and has been widely acknowledged as a viable way to reduce capital expenditures and operational costs. Although many companies have embraced this technology, some are unwilling to switch from internally owned and managed IT systems to cloud computing technologies due to fears of security threats and loss of control over company systems and data.
|align = "center"|'''Xcalibre Communications Ltd.'''
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|align = "center" bgcolor = "#000000E6EED5"|'''Offerings'''|align = "center" bgcolor = "#000000E6EED5"|EC2 (Elastic Compute Cloud) plus S3 (Simple Storage Service)|align = "center" bgcolor = "#000000E6EED5"|GoGrid|align = "center" bgcolor = "#000000E6EED5"|Google App Engine|align = "center" bgcolor = "#000000E6EED5"|Accelerator|align = "center" bgcolor = "#000000E6EED5"|GridLayer|align = "center" bgcolor = "#000000E6EED5"|The Hosting Cloud|align = "center" bgcolor = "#000000E6EED5"|Enterprise Cloud|align = "center" bgcolor = "#000000E6EED5"| FlexiScale
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|align = "center"|'''Provider<nowiki>’</nowiki>s Infrastructure'''
|High‐end x86‐based servers, high‐speed multi‐GB network, high‐end storage back end
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|align = "center" bgcolor = "#000000E6EED5"|'''Provider<nowiki>’</nowiki>s Data‐Storage System'''|bgcolor = "#000000E6EED5"|Amazon S3 Web service|bgcolor = "#000000E6EED5"|Storage is part of the server image; vendor plans to offer additional storage options|bgcolor = "#000000E6EED5"|Persistent storage with queries, sorting and transactions|bgcolor = "#000000E6EED5"|Sun Microsystems Sun Fire X4500 NAS storage|bgcolor = "#000000E6EED5"|Storage is built into the Grid; data is stored on multiple hard drives across multiple machines for redundancy|bgcolor = "#000000E6EED5"|Uses network‐attached storage devices|bgcolor = "#000000E6EED5"|Undisclosed|bgcolor = "#000000E6EED5"|Persistent storage based on a fully virtualized SAN/NAS back end
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|align = "center"|'''Supported Operating Systems'''
|Linux and Microsoft Windows
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|align = "center" bgcolor = "#000000E6EED5"|'''Supported Languages'''|bgcolor = "#000000E6EED5"|Linux and Red Hat Enterprise|bgcolor = "#000000E6EED5"|Java, .NET, Perl, PHP, Python, Ruby on Rails and most shell‐scripting languages|bgcolor = "#000000E6EED5"|Python|bgcolor = "#000000E6EED5"|Java, PHP, Python and Ruby on Rails|bgcolor = "#000000E6EED5"|Grid nodes will run any software that runs on a normal dedicated compute|bgcolor = "#000000E6EED5"|.NET, Perl, PHP, Python and Ruby on Rails|bgcolor = "#000000E6EED5"|Undisclosed|bgcolor = "#000000E6EED5"|Linux and Microsoft Windows
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|align = "center"|'''Supported Applications/'''<br>'''Framework'''
|Through partnership with CohesvieFT, customers can access a large number of preconfigured application stacks
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|align = "center" bgcolor = "#000000E6EED5"|'''Scalability'''|bgcolor = "#000000E6EED5"|Limited to 20 virtual computer instances during beta period; additional instances are allowed|bgcolor = "#000000E6EED5"|No limits on scalability|bgcolor = "#000000E6EED5"|Up to 5 million page views per month with preview release|bgcolor = "#000000E6EED5"|Contact vendor|bgcolor = "#000000E6EED5"|Up to 43 nodes. Bandwidth, RAM and CPU are changed on‐the‐fly. Process can be resized<br>(2 minutes per 1GB of data)|bgcolor = "#000000E6EED5"|Unlimited. Current users are pushing hundreds of millions of requests on single domains|bgcolor = "#000000E6EED5"|Undisclosed|bgcolor = "#000000E6EED5"|5 VDSes (Virtual Dedicated Servers) per account; more machines are available on request
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|align = "center"|'''Security'''
|Each customer has a VLAN; VDSes are separated by a Xen implementation; and customer data is stored in a T1 storage back end
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|align = "center" bgcolor = "#000000E6EED5"|'''Virtualization Technology'''|bgcolor = "#000000E6EED5"|Xen|bgcolor = "#000000E6EED5"|Xen|bgcolor = "#000000E6EED5"|Undisclosed|bgcolor = "#000000E6EED5"|Solaris Zones|bgcolor = "#000000E6EED5"|Based on 3tera AppLogic|bgcolor = "#000000E6EED5"|Undisclosed|bgcolor = "#000000E6EED5"|Undisclosed|bgcolor = "#000000E6EED5"|Xen
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|align = "center"|'''Redundancy Features'''
|A failed server is automatically removed from the cluster; VDSes running on it are automatically and transparently restarted on other servers
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|align = "center" bgcolor = "#000000E6EED5"|'''Load Balancing'''|bgcolor = "#000000E6EED5"|Undisclosed|bgcolor = "#000000E6EED5"|Yes; F5 Network BigIP load balancers.|bgcolor = "#000000E6EED5"|Yes|bgcolor = "#000000E6EED5"|Yes; F5 Network BigIP load balancers|bgcolor = "#000000E6EED5"|No. Customers can set up their own load balancing|bgcolor = "#000000E6EED5"|Yes; load‐balancing layer includes logic for multiple IP addresses for each customer site|bgcolor = "#000000E6EED5"|Undisclosed|bgcolor = "#000000E6EED5"|Yes; as optional add‐on
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|align = "center"|'''Control Panel'''
|Yes; API (application programming interface) also available. Control panel includes usage‐tracking tool
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|align = "center" bgcolor = "#000000E6EED5"|'''Development Tools'''|bgcolor = "#000000E6EED5"|Command‐line tools for building AMIs|bgcolor = "#000000E6EED5"|No, not necessary; plans to release public API with the same control as the Web interface|bgcolor = "#000000E6EED5"|Python runtime environment,|bgcolor = "#000000E6EED5"|Sandbox accelerators, central development and deployment, version control, unit test site and staging site available as add‐ons|bgcolor = "#000000E6EED5"|AppLogic has a scriptable command‐line interface for provisioning and scaling applications|bgcolor = "#000000E6EED5"|None|bgcolor = "#000000E6EED5"|Undisclosed|bgcolor = "#000000E6EED5"|No
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|align = "center"|'''Additional Cloud‐Storage Service'''
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==Technical overview==
