[Linux-cluster] question about failoverdomains

[Budai Laszlo]

Thank you for the link. I've found the answer to my question there.
Actually on this page: https://fedorahosted.org/cluster/wiki/FailoverDomains
And the answer is: Yes, the service will migrate back (fail back) to the
node which is member of its own domain.
On the other side, you are wrong about the fact that these domains does
not offer failover. That would be true if the domains were restricted.

Kind regards,
Laszlo

On 07/14/2011 06:52 PM, Digimer wrote:
> On 07/14/2011 11:42 AM, Budai Laszlo wrote:
>> Hi all,
>>
>> Please somebody tell me what is the behavior for the following
>> failoverdomains configuration:
>>
>> <failoverdomains>
>>   <failoverdomain name="dom1" ordered="0" restricted="0">
>>       <failoverdomainnode name="pnl-p" priority="1"/>
>>    </failoverdomain>
>>    <failoverdomain name="dom2">
>>       <failoverdomainnode name="psd-p" priority="1"/>
>>    </failoverdomain>
>> </failoverdomains>
>>
>>
>> This is a two node cluster. the idea is to create a configuration where
>> some of the services prefer to run on one node, and other on the other node.
>> For this I would have created two prioritized failover domains with the
>> priorities set in such a way that in one domain the one node has higher
>> priority than the other.
>>
>> My question related to this setup is:
>> if a node fails (let suppose pnl-p fails) then the services which are
>> configured to use dom1 will migrate to node psd-p. What will happen when
>> the node recovers? will that service fail back to that node?
>>
>> Thank you,
>> Laszlo
> These two domains will not offer failover. The domain contains only one
> node, so any services set to use either domain will only run on that
> given node. This is useful the cluster to starting local service (ie:
> clvmd, gfs2, etc).
>
> To get an ordered domain, define both nodes within a given domain, set
> 'ordered="1"' and then set different 'priority="<int>"'. The node with
> the lower priority will be the "preferred node" and the other will be
> the fall-back.
>
> Pay attention to the "nofailback" option as well.
>
> See: https://fedorahosted.org/cluster/wiki/RGManager
>