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Document the domain XML cache attribute for disk devices
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<pre>
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...
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<disk type='file'>
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<driver name="tap" type="aio">
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<driver name="tap" type="aio" cache="default">
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<source file='/var/lib/xen/images/fv0'/>
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<target dev='hda' bus='ide'/>
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<encryption type='...'>
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<dd>If the hypervisor supports multiple backend drivers, then the optional
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<code>driver</code> element allows them to be selected. The <code>name</code>
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attribute is the primary backend driver name, while the optional <code>type</code>
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attribute provides the sub-type. <span class="since">Since 0.1.8</span>
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attribute provides the sub-type. The optional <code>cache</code> attribute
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controls the cache mechanism, possible values are "default", "none",
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"writethrough" and "writeback". <span class="since">Since 0.1.8</span>
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</dd>
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<dt><code>encryption</code></dt>
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<dd>If present, specifies how the volume is encrypted. See
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