[Linux-HA] Xen live migration

[Sander van Vugt]

Hi Niels,

I haven't followed the most recent developments for the Xen HA resource
(so I'm sorry if I missed something), but there is a conceptional issue
I have with Heartbeat orchestrating a live migration: what would be the
criterium to start such a migration? Typically Heartbeat reacts when
either a node or a resource is dead. If a Xen resource is dead it cannot
be live migrated anymore (since it is dead), so you would need to
predict a disaster from happening in the next couple of seconds/minutes
and I don't really see how to do that.

Best Regards,
Sander


On Thu, 2008-01-03 at 13:17 +0100, Niels de Carpentier wrote:
> I'm trying to get live migration working in heartbeat, but somehow heartbeat 
> will only do stop/start, and not try migrate_to/migrate_from.
> 
> Both systems are running centos 5.1:
> 
> heartbeat-pils-2.1.2-3.el5.centos
> heartbeat-stonith-2.1.2-3.el5.centos
> heartbeat-2.1.2-3.el5.centos
> 
> The logs and the pe-input have been attached. Does anybody have any clue what 
> I'm doing wrong, and how I can get live migration to work?
> 
> The config is:
> 
> <group id="group_xen_sysman001">
>          <primitive class="ocf" id="sysman001" provider="heartbeat" 
> type="drbdlvmxen">
>            <operations>
>              <op id="sysman001_mon" interval="10s" name="monitor" 
> timeout="30s"/>
>            </operations>
>            <instance_attributes id="sysman001_iattr">
>              <attributes>
>                <nvpair id="sysman001_iattr_0" name="drbd" value="drbd3"/>
>                <nvpair id="sysman001_iattr_1" name="vg" 
> value="raid5_logging"/>
>                <nvpair id="sysman001_iattr_2" name="xmfile" 
> value="/etc/xen/sysman001.cfg"/>
>              </attributes>
>            </instance_attributes>
>            <meta_attributes id="sysman001_mattr">
>              <attributes>
>                <nvpair id="sysman001_mattr_0" name="allow_migrate" 
> value="true"/>
>              </attributes>
>            </meta_attributes>
>          </primitive>
>        </group>
> 
> 
> Anyother question I have is about the order of the migrate_to/migrate_from 
> commands. Are they both issued at the same time, or is the migrate_to command 
> issued first?
> 
> Thanks,
> 
> Niels de Carpentier
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