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<H4><a name="compression-method"></a>Compression method [<a href="#clonezilla-top" title="go to top of the page">^</a>]</H4> |
<H4><a name="compression-method"></a>Compression method [<a href="#clonezilla-top" title="go to top of the page">^</a>]</H4> |
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<p class="newcode"><a name="z_option"></a><font color="Red">-z1 gzip compression (fast with a smaller image)<br> |
<p class="newcode"><a name="z_option"></a><font color="Red">-z1p Use parallel gzip compression (testing), for multicore/CPU<br> |
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-z1 gzip compression (fast with a smaller image)<br> |
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-z2p Use parallel bzip2 compression (testing), for multicore/CPU<br> |
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-z2 bzip2 compression (slowest but smallest image)<br> |
-z2 bzip2 compression (slowest but smallest image)<br> |
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-z3 lzo compression (faster with image size approx. to that of gzip)(NOTE!!)<br> |
-z3 lzo compression (faster with image size approx. to that of gzip)(NOTE!!)<br> |
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-z4 lzma compression (slowest but also small image, faster decompression than bzip2)<br> |
-z4 lzma_compression_(slowest_but_also_small_image,_faster_decompression_than_bzip2)<br> |
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-z5p Use_parallel_xz_compression_(testing),_for_multicore/CPU<br> |
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-z5 xz_compression_(slowest_but_also_small_image,_faster_decompression_than_bzip2)<br> |
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-z6p Use_parallel_lzip_compression_(testing),_for_multicore/CPU<br> |
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-z6 lzip_compression_(slowest_but_also_small_image,_faster_decompression_than_bzip2)<br> |
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-z0 No compression (fastest but largest image size)</font></p> |
-z0 No compression (fastest but largest image size)</font></p> |
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<p>This option chooses the method which is used to compress the image while creating it.</p> |
<p>This option chooses the method which is used to compress the image while creating it.</p> |
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<p><b>Gzip</b> and <b>lzop</b> are fast compression methods. <b>Lzop</b> is many times faster than <b>gzip</b>, but creates slightly larger images. <b>Clonezilla Live</b> warns that <b>lzop</b> requires good-quality RAM, but I (the contributor who wrote this chapter) think other compression methods require good RAM too.</p> |
<p><b>Gzip</b> and <b>lzop</b> are fast compression methods. <b>Lzop</b> is many times faster than <b>gzip</b>, but creates slightly larger images. <b>Clonezilla Live</b> warns that <b>lzop</b> requires good-quality RAM, but I (the contributor who wrote this chapter) think other compression methods require good RAM too.</p> |
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<p><b>Bzip2</b> and <b>lzma</b> are powerful compression methods. <b>Lzma</b> creates a little smaller images than <b>bzip2</b>, and decompressing lzma-compressed images is faster than decompressing <b>bzip2</b> images. But there is no free lunch: <b>lzma</b> compression method is very slow compared even to <b>bzip2</b>, which isn't fast method either.</p> |
<p><b>Bzip2</b>, <b>lzma</b>, <b>xz</b> and <b>lzip</b> are powerful compression methods. <b>Lzma</b> creates a little smaller images than <b>bzip2</b>, and decompressing lzma-compressed images is faster than decompressing <b>bzip2</b> images. But there is no free lunch: <b>lzma</b> compression method is very slow compared even to <b>bzip2</b>, which isn't fast method either.</p> |
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<p><b>Lzma</b> method is becoming obsolete, and both <b>xz</b> and <b>lzip</b> are attempting to become its successor. They are a bit less powerful compression methods than <b>lzma</b>, but much faster. The differences between <b>xz</b> and <b>lzip</b> are virtually non-existent.</p> |
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<p>If you don't use the i486 version of <b>Clonezilla-SysRescCD</b>, parallel <b>gzip</b>, <b>bzip2</b>, <b>xz</b> and <b>lzip</b> compression methods are also available. Parallel compression means that each processor core compresses a different part of the image at a time. Without parallel compression one core compresses everything.</p> |
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<p>The speed impact caused by parallel compression depends on the number of processor cores available. In addition, Hyper-Threading increases the speed by about 30 %. For example, if your processor contains four cores and supports Hyper-Threading, speed with parallel compression is nearly 5,2 times as high as without. However, parallel compression is currently an experimental feature - and it just decreases speed if the processor contains only one core and doesn't support Hyper-Threading.</p> |
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<p>If you don't know if parallel compression increases or decreases the speed on your computer, try it anyway. The negative speed impact it may cause isn't big.</p> |
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<H4><a name="splitting"></a>Splitting [<a href="#clonezilla-top" title="go to top of the page">^</a>]</H4> |
<H4><a name="splitting"></a>Splitting [<a href="#clonezilla-top" title="go to top of the page">^</a>]</H4> |
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