On numerous occations I've had a need for synchronizing directories of files & subdirectories. I've used it for synchronizing work files from my stationary PC to my laptop in the pre-always-on era (today I use SVN for almost all files that needs to be in synch). Recently I needed to implement a very KISS backup solution that simply synchronized two directories once a week for offsite storing of the backup data.
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Once you start receiving visitors from all over the world, a new kind of scaling issue arise. It's not a matter of adding more servers to the cluster or optimizing code (we'll assume these factors are perfect), it's a simple matter of geography and mathematics. Serving code from one end of the world to the other will take time, no matter how quick your servers are handling the request. The speed of light suddenly seems quite slow.
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Some time ago Peter Loft Jensen wrote about how to easily give a user account the neccessary permissions to access the IIS metabase & required directories, and thus be used for running the IIS process.
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Before attempting to optimize code or fix any kind of load issue, you should first gather data and become aware of what bottlenecks you're experiencing. A great way to do this is through the Performance Monitor application. Recently I tried monitoring my ASP.NET applications, but all my counters had a value of 0. As I thought initially, it's a simple problem, but the solution was not easily found.
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There are two primary reasons for venturing into the realms of clustering/load balancing - availability & scalability. In this post I'll give a quick demo of how to setup Windows Network Load Balancing (NLB) on Server 2003 and how it affects the availability of a web application.
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I spend a lot of time architecting for scalability, availability and security during my daily work. Currently I've got a distributed system consisting of several windows services communicating across machines using WCF and authenticating through Active Directory.
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