sheepdog+libvirt

添加xml文件：

官方xml文件：

<disk type='network'>
    <driver name="qemu" type="raw" io="threads" ioeventfd="on" event_idx="off"/>
    <source protocol="sheepdog" name="image_name">
      <host name="hostname" port="7000"/>
    </source>
    <target dev="hdb" bus="ide"/>
    <boot order='1'/>
    <transient/>
    <address type='drive' controller='0' bus='1' unit='0'/>
 </disk>

实际测试发现，qemu需要添加path才支持部分功能：如 ioeventfd="on" event_idx="off"和<transient/>

部分patch地址：https://www.redhat.com/archives/libvir-list/2011-August/msg00555.html

实践可用xml文件：

<disk type='network'>
    <driver name="qemu" type="raw" io="threads"/>
    <source protocol="sheepdog" name="image_name">
      <host name="hostname" port="7000"/>
    </source>
    <target dev="hdb" bus="ide"/>
    <boot order='1'/>
    <address type='drive' controller='0' bus='1' unit='0'/>
</disk>

 multipath配置：

>> multipaths {
>>         multipath {
>>                 wwid                    $SCSI_ID
>>                 alias                   sheepdog-iscsi
>>                 path_grouping_policy    failover
>>                 path_checker            readsector0
>>                 path_selector           "round-robin 0"
>>                 failback                manual
>>                 rr_weight               priorities
>>                 no_path_retry           5
>>         }
>> }