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conf: Introduce new XML tag "mode" for disk source

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There are two ways to use a iSCSI LUN as disk source for qemu.

 * The LUN's path as it shows up on host, e.g.
   /dev/disk/by-path/ip-$ip:3260-iscsi-$iqn-fc18:iscsi.iscsi0-lun-1

 * The libiscsi URI from the storage pool source element host attribute, e.g.
   iscsi://demo.org:6000/iqn.1992-01.com.example/1

For a "volume" type disk, if the specified "pool" is of iscsi
type, we should support to use the LUN in either of above 2 ways.
That's why to introduce a new XML tag "mode" for the disk source
(libvirt should support iscsi pool with libiscsi, but it's another
new feature, which should be done later).

The "mode" can be either of "host" or "direct". Use "host" to indicate
use of the LUN with the path as it shows up on host. Use "direct" to
indicate to use it with the source pool host URI (future patches may support
to use network type libvirt storage too, e.g. Ceph)
This commit is contained in:
John Ferlan
2013-07-18 13:18:03 -04:00
parent 5c62d5ea07
commit c00b2f0dd1
6 changed files with 110 additions and 2 deletions
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11
docs/formatdomain.html.in
View File

@@ -1601,7 +1601,16 @@
<code>pool</code> and <code>volume</code>. Attribute <code>pool</code>
specifies the name of storage pool (managed by libvirt) where the disk
source resides, and attribute <code>volume</code> specifies the name of
storage volume (managed by libvirt) used as the disk source.
storage volume (managed by libvirt) used as the disk source. For a
"volume" type disk, if the underlying storage pool is "iscsi", attribute
<code>mode</code> (<span class="since">since 1.1.1</span>) can be used
to indicate how to represent the LUN as the disk source. The value
"host" indicates to use the LUN's path as it shows up on host, e.g.
/dev/disk/by-path/ip-10.11.12.9:3260-iscsi-iqn.2013-06.fc:iscsi.iscsi0-lun-1).
The value "direct" indicates to use the storage pool's
<code>source</code> element <code>host</code> attribute as the
disk source for the libiscsi URI, e.g.
file=iscsi://demo.org:6000/iqn.1992-01.com.example/1.
<span class="since">Since 0.0.3; <code>type='dir'</code> since
0.7.5; <code>type='network'</code> since
0.8.7; <code>protocol='iscsi'</code> since 1.0.4;

8
docs/schemas/domaincommon.rng
View File

@@ -1173,6 +1173,14 @@
<attribute name="volume">
<ref name="volName"/>
</attribute>
<optional>
<attribute name="mode">
<choice>
<value>host</value>
<value>direct</value>
</choice>
</attribute>
</optional>
<optional>
<ref name="startupPolicy"/>
</optional>