DISIT Lab of University of Florence | DISIT Lab of University of Florence

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Warning: Duplicate entry '4731972' for key 'PRIMARY' query: INSERT INTO watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (0, 'php', '%message in %file on line %line.', 'a:4:{s:6:\"%error\";s:7:\"warning\";s:8:\"%message\";s:256:\"file_get_contents(http://www.disit.org/RightBarMM.html) [<a href=\'function.file-get-contents\'>function.file-get-contents</a>]: failed to open stream: Unable to find the socket transport "ssl" - did you forget to enable it when you configured PHP?\";s:5:\"%file\";s:110:\"C:\\Programmi\\Apache Software Foundation\\Apache2.2\\htdocs\\drupal\\sites\\default\\themes\\custom\\eclap\\template.php\";s:5:\"%line\";i:41;}', 3, '', 'http://www.disit.org/drupal/?axoid=urn%3Aaxmedis%3A00000%3Aobj%3Ac9ab8cc7-8145-4354-8c68-b3a058c5f6d0&q=it%2Fhome', '&# in C:\Programmi\Apache Software Foundation\Apache2.2\htdocs\drupal\includes\database.mysqli.inc on line 128
DISIT Lab of University of Florence | DISIT Lab of University of Florence

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Titolo ICARO project: D3.27.3 Cloud Simulator, Design, User Manual and Test

Soggetto Cloud Simulation

Descrizione The first step in developing a new simulator is to decide which of the below challenges the developer wants to engage. In fact, most of the simulators already developed are focused on one challenge only. In (1) (2) are described the major challenges that prevent the cloud as being a standard platform as: Security: since all the storage and computations are processed in cloud servers, the importance of confidentiality, data integrity and non-repudiation issues are predominant. Cost Modeling: cloud computing has a unique pay-as-you-go service model; through which organizations pay only for what is being used and nothing more. For example, it might be highly beneficial for a company if a brand new high powered server farm could be obtained to introduce a new web based market offering with zero upfront capital. Energy Management: due to fluctuation of workload, the average load is only 30% of data center resources and rest of the 70% account putting resources in sleep mode, so the main goal is to run an application with a minimum set of computing resources and maximize the resources that are in sleep mode (3) (4) Virtual Machine Migration: since cloud computing is a distributed system, when the workload is increased in a particular data center, virtual machine migration helps to prevent performance degradation of the system.

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Pubblicato da root il Sab, 2015-05-16 17:59

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