[Linux-HA] "one-way" dependency

[Lars Marowsky-Bree]

On 2007-02-28T14:53:14, Yan Fitterer <yfitterer at novell.com> wrote:

> I have two resource groups: A and B.
> 
> I need:
> 1) B depends on A
> 2) A does NOT depend on B
> 3) A and B must always run on the same node.
> 
> Currently, I have:
> 
>  <constraints>
>    <rsc_colocation id="CL_A_B" from="A" to="B" score="INFINITY"/>
>    <rsc_order id="OR_B_1" from="B" type="after" to="A" action="start" symmetrical="false"/>
>    <rsc_order id="OR_B_2" from="B" type="before" to="A" action="stop" symmetrical="false"/>
>  </constraints>
> 
> 
> But if I stop B, A gets stopped as well.
> 
> How can I solve this?

First, you're hitting a deficiency in rsc_colocation constraints on the
version you're running. This will be fixed by the heartbeat version in
SLES10 SP1.

Second, your rsc_order constraints are pointless - a single rsc_order
symmetrical constraint would have done the same: <rsc_order id="A_B"
from="B" to="A"/>


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