[Pacemaker] Stonith Device APC AP7900

[Dejan Muhamedagic]

Hi,

On Tue, Nov 02, 2010 at 08:08:32AM +0100, Pavlos Parissis wrote:
> On 1 November 2010 15:01, Rick Cone <rcone at securepaymentsystems.com> wrote:
> 
> > Dejan,
> >
> > Below I had:
> >
> > primitive res_stonith stonith:apcmastersnmp \
> >         params ipaddr="192.1.1.109" port="161" community="sps" \
> >         op start interval="0" timeout="60s" \
> >         op monitor interval="60s" timeout="60s" \
> >          op stop interval="0" timeout="60s"
> > clone rc_res_stonith res_stonith \
> >         meta target-role="Started"
> >
> > And you commented:
> >
> > You can also use a single instance setup, i.e. without clones.
> >
> > What is this "single instance setup", and what would it look like in the
> > crm
> > configure?
> 
> 
> You have one already, res_stonith  is your single instance setup.

Yes, just don't clone that resource.

> What are the pros/cons to this compared to the clone setup I
> > have?
> >
> 
> The decision of cloned or non-cloned stonith resource is mainly driven about
> the ability of the fencing device to accept multiple connections
> simultaneously.
> If you fencing device doesn't allow that then you can only use a non-cloned
> resource.

Right.

> The cloned resource will fence a node a bit faster in a case stonith
> resource is running on the node to be fenced, there is no need to move the
> resource to another node and then fence the node.

Did you measure the time it takes to start the stonith resource?

> But, cloned resource is has a bit more complex configuration. cloning looks
> easy but I bet there is some complexity behind it.

There is, but in this simple case where clones are not in any
relation to other resources, that shouldn't pose a problem.

> I have experiment with both versions on AP9606 using the rackpdu agent and
> in both cases worked as expected. Now I am expecting a Aviosys 9258ST and I
> will use the non-cloned version.

Thanks,

Dejan

> My 2 cents,
> Pavlos

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