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Swap space --- There is no hard-and-fast rule about the amount of swap space required by a system. Most people recommend that you have twice as much swap as RAM. I would add that you probably want to have at least 512MB of virtual RAM so your swap space should be &gt;= (512MB - &lt;actual RAM&gt;). Pick the larger of the two values.
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Swap space --- There is no hard-and-fast rule about the amount of swap space required by a system. Most people recommend that you have twice as much swap as RAM. I would add that you probably want to have at least 512MB of virtual RAM so your swap space should be >= (512MB - <actual RAM>). Pick the larger of the two values.

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What is the technical difference between Linux and &quot;Linux extend&quot; partition. When is it necessary to use it ? <br />
According to Swap partition, What is the size that is suitable for ? How can I know what size of swap space I should have ?<br />
If I have the large disk space such as 20 GB , Which is the best partition allocation it should be ? Have any methods to calculate ?
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What is the technical difference between Linux and "Linux extend" partition. When is it necessary to use it ? 
According to Swap partition, What is the size that is suitable for ? How can I know what size of swap space I should have ?
If I have the large disk space such as 20 GB , Which is the best partition allocation it should be ? Have any methods to calculate ?

Linux partition

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.