Hi Neil,
Could you expand a bit more on the interaction of the proposed
Agent with Xen DomU migration? The proposal says:
>> We expect that the workload management aspect of the agent will
allow a DomU to use migration or live migration.
Was the proposal that migration would be triggered by a "clrg
switchover" command and the Agent implementation would then perform the
migration underneath. Or, would the implementation actually support the
migration being done directly via the Xen admin commands?
Also, did not understand this point:
>> - Allow for important DomUs where lesser DomUs are "offlined".
Was that plugging into some existing Xen workload management
tools and essentially the proposal then is that the domUs under the
control of such a workload management facility would be "compatible"
in some fashion with the proposed Agent? Concretely, perhaps that may
mean that the Agent would be smart enough that it would understand the
fact that the domU has been offlined "intentionally" and hence would
not failover/restart it?
Rest looks good.
Thanks,
-ashu
> Neil Garthwaite wrote:
>> Hello everyone,
>>
>> I would like to propose developing an agent to failover Xen Guest Domains
>> ontop of OHAC.
>>
>> The purpose of the agent is to provide workload management and high
>> availability for supported Xen Guest Domains (DomU) ontop of OHAC.
>> Currently supported configurations can be found here,
>>
>> http://opensolaris.org/os/community/xen/docs/specs.html
>>
>> We expect that the workload management aspect of the agent will allow a DomU
>> to use migration or live migration.
>>
>> We expect that the high availability aspect of the agent will failover a
>> DomU in the event of a node failure.
>>
>> More specifically if a DomU is being moved from one node to another,
>> workload management will be performed first followed by high availability if
>> a node fails while workload management is being performed.
>>
>> Furthermore, we expect that the agent will,
>>
>> - Allow start/stop and restart dependencies for DomUs across nodes.
>> - Allow for important DomUs where lesser DomUs are "offlined".
>>
>> for both workload management and high availability.
>>
>> If this proposal is approved, my intention is to also engage with the
>> OpenSolaris Xen community.
>>
>> Many thanks in advance for considering this proposal.
>>
>> Regards
>> Neil
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