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113 lines
4.3 KiB
HTML
113 lines
4.3 KiB
HTML
<!doctype html public "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html>
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<head>
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<link rel="stylesheet" type="text/css" href="style.css" />
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<title>SnapRAID</title>
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
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<meta http-equiv="cache-control" content="no-cache" />
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<meta name="description" content="A backup program for disk arrays. It stores parity information of your data and it recovers from up to six disk failures" />
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<meta name="keywords" content="snapraid snapshot raid backup disk array redundancy parity" />
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<meta name="author" content="Andrea Mazzoleni" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<script type="text/javascript">
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var _gaq = _gaq || [];
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_gaq.push(['_setAccount', 'UA-21967501-1']);
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_gaq.push(['_trackPageview']);
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(function() {
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var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
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ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
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var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
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})();
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</script>
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</head>
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<body>
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<div id="title">
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</div>
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<div id="bar">
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<a href="index.html">About</a>
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<a href="download.html">Download</a>
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<a href="design.html">Design</a>
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<a href="compare.html">Compare</a>
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<a href="faq.html">FAQ</a>
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<a href="manual.html">Manual</a>
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<a href="https://sourceforge.net/p/snapraid/discussion/1677233/">Forum</a>
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<a href="authors.html">Authors</a>
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</div>
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<div id="main">
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<p>
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<span class="bold">SnapRAID</span> was created following the <a href="http://en.wikipedia.org/wiki/Unix_philosophy">Unix philosophy</a>:
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<em>Write programs that do one thing and do it well</em>.
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</p>
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<p>
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The first design principle was <span class="bold">reliability</span>.
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The result is a simple architecture and an easy to understand implementation,
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following the <a href="http://en.wikipedia.org/wiki/Edsger_W._Dijkstra">Dijkstra</a>
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quote <i>Simplicity is prerequisite for reliability</i>.
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</p>
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<p>
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Extensive and automated tests with the runtime checker <a href="http://valgrind.org/">valgrind</a> and
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the static analyzer <a href="http://clang-analyzer.llvm.org/">clang</a> are done to ensure the correctness of the final application.
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The test has a <a href="cov/">code coverage of over 90%</a>, measured with <a href="http://ltp.sourceforge.net/coverage/lcov.php">lcov</a>.
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</p>
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<p>
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The second design principle was <span class="bold">robustness</span>.
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It supports any kind of problem. Even on kernel panics, power-downs
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or any other hard failure at runtime, your redundancy data is in safe hands.
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<br>
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It uses all the possible storage techniques to ensure to always keep consistent
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redundancy even after critical interruptions.
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</p>
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<p>
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The third design principle was <span class="bold">efficiency</span>.
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It's a native C application highly optimized using all the
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possible OS services to ensure the maximum throughput of you disk array.
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</p>
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<p>
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For integrity checks is used the highly efficient <a href="http://code.google.com/p/smhasher/">murmur3</a>
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and <a href="http://burtleburtle.net/bob/hash/spooky.html">SpookyHash</a> hashes at 128 bits.
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For the redundancy computations we use a
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<a href="https://github.com/amadvance/snapraid/tree/master/raid">RAID library</a>
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written from scratch that supports up to six levels of parity delivering top-notch performance.
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The library design is originally based, and also binary compatible,
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with the <a href="http://lxr.linux.no/linux+*/lib/raid6">Linux Kernel RAID</a>
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library made by H. Peter Anvin.
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As internal data base it's used the <a href="http://www.tommyds.it/">TommyDS</a> library of data structures.
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</p>
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</div>
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<div id="bottombar">
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<div style="float: left; width: 50%;">
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<span class="bold">Donate with</span>
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<br/>
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<a href="http://sourceforge.net/p/snapraid/donate/"><img src="paypal.png"/></a>
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<a href="https://coinkite.com/u/amadvance/"><img src="bitcoin.png"/></a>
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</div>
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<div style="float: left; width: 50%;">
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<span class="bold">Find other resources at</span>
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<br/>
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<a href="https://github.com/amadvance/snapraid/"><img src="github.png"/></a>
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<a href="http://sourceforge.net/projects/snapraid/"><img src="sourceforge.png"/></a>
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<a href="https://travis-ci.org/amadvance/snapraid/"><img src="travisci.png"/></a>
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</div>
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</div>
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</body>
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</html>
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