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docs: Enhance documentation of the old-style boot configuration

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Also encourages people to use per-device boot elements for better
control.
This commit is contained in:
Jiri Denemark 2012-02-03 13:33:36 +01:00
parent d9d518b1c8
commit 4f20dedfd4
1 changed files with 17 additions and 5 deletions
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docs/formatdomain.html.in
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@ -131,12 +131,24 @@
<dd>The <code>dev</code> attribute takes one of the values "fd", "hd",
"cdrom" or "network" and is used to specify the next boot device
to consider. The <code>boot</code> element can be repeated multiple
times to setup a priority list of boot devices to try in turn. The
<code>boot</code> element cannot be used if per-device boot elements
are used (see <a href="#elementsDisks">disks</a>,
times to setup a priority list of boot devices to try in turn.
Multiple devices of the same type are sorted according to their
targets while preserving the order of buses. After defining the
domain, its XML configuration returned by libvirt (through
virDomainGetXMLDesc) lists devices in the sorted order. Once sorted,
the first device is marked as bootable. Thus, e.g., a domain
configured to boot from "hd" with vdb, hda, vda, and hdc disks
assigned to it will boot from vda (the sorted list is vda, vdb, hda,
hdc). Similar domain with hdc, vda, vdb, and hda disks will boot from
hda (sorted disks are: hda, hdc, vda, vdb). It can be tricky to
configure in the desired way, which is why per-device boot elements
(see <a href="#elementsDisks">disks</a>,
<a href="#elementsNICS">network interfaces</a>, and
<a href="#elementsUSB">USB and PCI devices</a> sections below).
<span class="since">Since 0.1.3, per-device boot since 0.8.8</span>
<a href="#elementsUSB">USB and PCI devices</a> sections below) were
introduced and they are the preferred way providing full control over
booting order. The <code>boot</code> element and per-device boot
elements are mutually exclusive. <span class="since">Since 0.1.3,
per-device boot since 0.8.8</span>
</dd>
<dt><code>bootmenu</code></dt>
<dd> Whether or not to enable an interactive boot menu prompt on guest