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Azure, SLAs and CAP theorem

Ask Time:2010-03-24T01:13:08         Author:dayscott

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  1. Azure itself is imo PaaS and not IaaS. Do you agree?

  2. MS gurantees an availability of 99% and a strong consistency. You can find MS SLAs here: http://www.microsoft.com/windowsazure/sla (three SLAs Uptime: http://img229.imageshack.us/img229/4889/unbenanntqt.png ) I can't find anyhing about how they are going to archive that. Do they do backups? If Yes: How do they manage consistency? According to the Cap theorem (http://camelcase.blogspot.com/2007/08/cap-theorem.html ) their claims are not realistic. 2.1 Do you know detailed technical stuff about the how they are going to realize the claims about consistency and availability?

  3. On the MS page you'll find three SLAs .docs, one for SQL Azure, the second for Azure AppFabric/.Net Services and the third for Azure Compute&Storage.(Screenshot in 1.) How can one track whether SLAs are violated? Do they offer some sort of monitor, so I don't have to measure the uptime by myself?

Author:dayscott,eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article:https://stackoverflow.com/questions/2502024/azure-slas-and-cap-theorem
dmeister :

1) Azure is a classical \"Platform as a Service\". I agree\n\n2) 99% is not a very high availability. It means that Azure is allowed to be 3 full days down per year. The blog article you referenced is IMHO quite suboptimal. There is another one that explains the CAP theorem in more detail. ",
2010-03-23T17:22:25
jball :

In answer to your first point, MS itself calls Azure the \"Windows Azure Platform\", so its status as PaaS seems self-evident.\n\nIn response to your question about backups in the second point, one of the main promises of cloud computing is to allow you to ignore the administration of the resources. They promise safe data, it's up to you as to whether you trust them, but if you want to know exactly how they implement it, you're missing the point of the cloud abstraction.\n\nThe third point is more interesting, but I would assume it's up to you to pay attention (write monitoring software?) to whether they live up to their SLAs.",
2010-03-23T17:18:05
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