11/7/2023 0 Comments Oracle coherence virtual box image![]() ![]() There is an investment in getting everything set up to use EC2 effectively, but if the task is going to be repeated many times, then it is a worthwhile investment. many server) tasks, it can be quite useful and cost-effective. "Amazon’s EC2 is the only easy way to put a data center on your credit card.įor short duration, high-resource (i.e. Vice President of Development, Cameron Purdy, told InfoQ: Oracle's Coherence Data Grid team, for example, make use of EC2 for testing purposes. However, the same pricing model makes EC2 very good value for both low-capacity web servers or for certain other situations such as batch processing where the service isn't required 24 hours/day, or testing where the service is only required for short elapsed periods of time. It is also worth noting that the costs rise sharply when using the larger VM instances for a 24/7 service - an extra large VM would cost over $7,000/year. A larger VM based environment creates other challenges too since they can be difficult to set-up and maintain. ![]() ![]() Furthermore since the EC2 environment is VM based you cannot use low level performance techniques such as kernel modifications or other OS level optimizations commonplace in heavy duty Linux environments. These are generally more limited than their hardware equivalents since advanced techniques such as TCP buffering (where the load balancer buffers responses from the web server to send to slow clients, thereby freeing the web server to move on to other tasks) or SSL offload cannot be implemented. Secondly, for horizontal scalability you have to rely on software load-balancing techniques. For one thing you are restricted in vertical scale terms by the largest VM size offered by Amazon. EC2 does have some significant scalability limitations however. The EC2 environment generally performs well and some initial tests by RightScale suggest that the network throughput for both EC2 and Amazon's Simple Storage Service (S3) is very high. A number of AMI files are already available for download including two for GigaSpaces and a Tomcat-based JEE environment. This provides a mechanism for customers to post and publicly share AMIs either to jump-start a particular product or as a revenue stream where companies and individuals offer paid image files. Moreover VM images, which Amazon calls Amazon Machine Images (AMIs), can be archived and transported in a manner analogous to VMware's virtual appliances. This mix and match approach is particularly useful if, for example, you need a heavy-weight VM for database processing with two lightweight VMs providing an application server service. 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. So in addition to the default small instance (1.7 GB of memory, 1 1.0-1. The virtual machine structure allows Amazon to offer a variety of VM sizes up to the physical limits of the hardware. Then, using either a web services API or a script-wrapper around that API, you can quickly deploy to any number of virtual machines. It allows a developer to create Linux based virtual machines, either from scratch or using pre-built image files. EC2 is a computing service based on a Xen hypervisor structure. An example of such a service is Amazon's Elastic Computer Cloud (EC2) which was announced in the summer of 2006. Whilst the idea of Software as a Service (SaaS) is increasingly mainstream Hardware as a Service (HaaS) is still a new concept. ![]()
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