[Pacemaker] Temporarily disabling the cluster

[Lars Marowsky-Bree]

On 2008-09-09T23:09:30, Xinwei Hu <hxinwei at gmail.com> wrote:

> But. If there are 2 completely irrelevant resources, Ra & Rb. It'll be
> very reasonable that the customer want to upgrade Rb while letting
> pacemaker still monitoring Ra. What's best practice to do so then ?

The problem is that all resources which are linked to the one resource
in maintenance mode (assuming that this was possible) are implicitly
also frozen.

This extends to all rsc_colocation and order constraints, but also
possibly a stop failure (which would cause the node to be fenced).

So yes, a per-resource approach would be better and more fine-grained,
but a global mode is also needed - that would also be needed for the
rolling upgrades of the cluster stack.

So, the global option is a first step, solving 80% of the problem. We
can consider the last 20% later, which are also quite a bit harder ;-)


Regards,
    Lars

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