[Linux-HA] Ordering Resource Groups V2

[Andrew Beekhof]

On Dec 14, 2007, at 5:46 AM, Damon Estep wrote:

> I have created an order constraint that requires a DRBD/iSCSI target
> resource group to be up before an application resource groups comes  
> up.
>
>
>
> At startup the order is honored, and the resource groups come up in  
> the
> desired order.

depending on your version, you might need to add:
    symmetrical="true"
and
    score="INFINITY"
to the ordering constraint

the first should make the resources stop in the reverse order.
the second will make sure that the other two resources will be stopped  
if iscsi_resources isn't running

i'd recommend the latest interim build and this document http://oss.beekhof.net/~beekhof/heartbeat/docs/Ordering-Explained.pdf

> In the event of a failover in the storage group I would like the
> application groups to go offline while the storage group fails over to
> another node, otherwise the applications will crash because they have
> lost access to the storage.
>
>
>
> The application resource groups do not stop while the storage group
> recovers.
>
>
>
> If two groups are created, call them resource1 and resource2, and then
> an order constraint is created where resource1 before resource2,  
> should
> resource2 go offline during a failover of resource1? In my test setup
> they do not.
>
>
>
> This is a 5 node non-symmetrical cluster with the storage resource  
> group
> constrained to 2 nodes and the application resource group running on 2
> nodes, with the 5th node being the failover target for the other 2
> application nodes.
>