[Linux-HA] resource group design question (2)

[Andrew Beekhof]

On 10/12/07, Daniel X Moore <dxm at sgi.com> wrote:
> matilda matilda wrote:
> > first to your question: I'm pretty sure you can't configure that.
> > My question or better interest is: For what do you need that?
>
> I guessed that :) I'm also hoping that there's a relatively easy way we
> could implement support for such a feature that might be useful to the
> community.
>
> > The group primarily for handling the group as one entity, ordered
> > or unordered. Their will be never a "at the same time" anyway.
> > So, if your RA is called with "a,b,c" what does it do with that?
> > Does the RA control the sequence? Start/Stop it at the same time,
> > which will never happen?
>
> We currently implement the desired behaviour by having a list just like
> that and a single resource. The single resource starts multiple
> sub-resources.

ok

> But this prevents us from adding/removing sub-resources
> effectively as HB knows nothing of them.

in what way does HB prevent this?
if you change the value then we'll tell your resource the new value.

> > I'm really interested in that use case. It's morning here and I
> > can only imagine that you want to dynamically order the way the
> > parts are handled.
>
> Each resource within the group needs a number of sub-resources
> started/stopped and the sequence is mixed up between the resources when
> starting/stopping everything together.

define "mixed up"

> Hope this explains it!

not really - but maybe i'm thick