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People want their servers, and, of course, the projects that are running on them, to be available all the time, and to bring maximum revenue at the same time. In a real-life situation, it is more than clear that pure 100% availability is impossible to achieve, especially if a single hardware device is involved. There can be unpredicted factors that affect availability, either at software or hardware level. Most common examples: power failures network device failures sysadmin’s mistakes Most of these factors can be excluded, or their impact can be reduced to a minimum, by a careful initial design and planning, and eliminating any SPOF (*single point of failure), whenever possible, of course.
What to account for when starting a file hosting platform*The following article is in no way a complete "HOWTO" on designing and implementing a file hosting platform. It is to be taken as a series of recommendations on the subject* First of all, we need fast storage servers. One would think that a few bulky servers with lots of HDD space, fast RAID10 arrays and Gig uplinks would be enough. In a real-world situation - this is not quite right. You will soon notice that you can't get even 2-300Mbit traffic from these servers, since the bottleneck in this situation would be the hard drives, which will have to do random multiple reads and writes concurrently.
This article is covering the configuration of the DSR load balancing mode  on the Alteon load balancers running WebOS 10 and a couple of Linux systems acting  as real servers. Alteon 180/184 series load balancers is a cheap solution to handle at least 1 Gigabit of load balanced web traffic, when using DSR. As per Wikipedia, load balancing is a technique to spread work between two or more computers, network links, CPUs, hard drives, or other resources, in order to get optimal resource utilization, maximize throughput, and minimize response time. Usage of multiple components with load balancing, instead of a single component, may increase reliability through redundancy.
One of our customers asked to made a script, which will suspend his hosting customers if they are using too much resources. The goal was to collect cpu usage by 1. apache and mod_php 2. mysql 3. cgi/daemons 4. mail The tool will get actual resource usage every 5 minutes and will save the data in a dbm database. Actually, we started with apache resources usage. The utility is collecting cpu usage per user , vhost and even requested url. The first try could be downloaded here, available for Cpanel servers only. I do not recommend at all to run it on non-Cpanel servers.
RSMail is a complete mail server management software. People can easily manage their mail server, POP3/IMAP server, configure spam filters and antivirus protection in its web based interface. We created a small page with several screenshots, for people interested in its actual state.


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