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copied!<p>i think your own idea is not the worst one. get a bunch of servers, and for every file store which server(s) it's on. if new files are uploaded, use most-free-space first*. every server handles it's own delivery (instead of piping through the main server).</p> <p><strong>pros:</strong></p> <ul> <li><p>use multiple servers for a single file. e.g. for cutekitten.jpg: <code>filepath="server1\cutekitten.jpg;server2\cutekitten.jpg"</code>, and then choose the server depending on the server load (or randomly, or alternating, ...)</p></li> <li><p>if you're careful you may be able to move around files automatically depending on the current load. so if your cute-kitten image gets reddited/slashdotted hard, move it to the server with the lowest load and update the entry.<br> you could do this with a cron-job. just log the downloads for the last xx minutes. try some formular like (downloads-per-minute<em>filesize</em>(product of serverloads)) for weighting. pick tresholds for increasing/decreasing the number of servers those files are distributed to.</p></li> <li><p>if you add a new server, it's relativley painless (just add the address to the server pool)</p></li> </ul> <p><strong>cons:</strong></p> <ul> <li><p>homebrew solutions are always risky</p></li> <li><p>your load distribution algorithm must be well tested, otherwise bad things could happen (everything mirrored everywhere)</p></li> <li><p>constantly moving files around for balancing adds additional server load</p></li> </ul> <p><code>*</code> or use a mixed weighting algorithm: free-space, server-load, file-popularity</p> <p>disclaimer: never been in the situation myself, just guessing.</p>

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