<dd>
The optional driver element allows specifying further details
related to the hypervisor driver used to provide the disk.
- <span class="since">Since 0.1.8; <code>io</code> attribute
- since 0.8.8</span>
+ <span class="since">Since 0.1.8</span>
<ul>
<li>
If the hypervisor supports multiple backend drivers, then
The optional <code>cache</code> attribute controls the
cache mechanism, possible values are "default", "none",
"writethrough" and "writeback".
+ <span class="since">Since 0.6.0</span>
</li>
<li>
The optional <code>error_policy</code> attribute controls
how the hypervisor will behave on an error, possible
values are "stop", "ignore", and "enospace".
+ <span class="since">Since 0.8.0</span>
</li>
<li>
The optional <code>io</code> attribute controls specific
policies on I/O; qemu guests support "threads" and
- "native".
+ "native". <span class="since">Since 0.8.8</span>
</li>
</ul>
</dd>