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Rough Type: Nicholas Carr's Blog: EMC's "very massive" storage cloud
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Cloud storage is massive. Very massive. We're routinely encountering new requirements where terms like "gigabyte" and "terabyte" are not useful, the discussion starts at "many petabytes" and goes up from there.
We tend to think of all this stuff sitting in a data center somewhere, but for this model, it just doesn't work. Nobody can afford a single data center that's large enough to put all this stuff into (no, not even Google). More importantly, no one can afford the network pipes that'll be needed in a single place to feed everything into, or out of.
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No, what you'll need is the ability to place these devices in locations around the world, and have them operate as a single entity: a single global name space, and - more importantly - the ability to ingest content from anywhere, and move content to popular places depending on traffic and interest
Amazon.com: Amazon EC2, Amazon Elastic Compute Cloud, Virtual Grid Computing: Amazon Web Services
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Data transferred between Amazon EC2 and Amazon S3-US or Amazon SimpleDB, is free of charge (i.e., $0.00 per GB)
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Amazon S3 usage is billed separately from Amazon EC2; charges for each service will be billed at the end of the month.
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InfoQ: Amazon EC2 Gains Favor with JEE and Groovy Developers
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So in addition to the default small instance (1.7 GB of memory, 1 1.0-1.2 GHz 2007 Opteron/Xeon processor, 160 GB of instance storage, 32-bit platform) Amazon now offers large (7.5 GB of memory, 4 processors spec as before, 850 GB of instance storage, 64-bit platform) and extra large (15 GB of memory, 8 processors spec as before, 1690 GB of instance storage, 64-bit platform) instances.
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you need a heavy-weight VM for database processing with two lightweight VMs providing an application server service.
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Computer Laboratory - Xen virtual machine monitor
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Firstly, virtual
machines must be isolated from one another: it is not acceptable for
the execution of one to adversely affect the performance of
another. -
Secondly, it is necessary to support a
variety of different operating systems to accommodate the
heterogeneity of popular applications. - 1 more annotations...
Rail Spikes: Deploying Rails on EC2
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Same with your database; make sure you’re backing it up frequently to S3 or some other safe place
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