[DRBD-user] DRBD demote/promote not called - Why? How to fix?

Lars Ellenberg lars.ellenberg at linbit.com
Mon Nov 14 10:12:28 CET 2016

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Sat, Nov 12, 2016 at 09:45:39AM +0000, CART Andreas wrote:
> To: drbd-user at lists.linbit.com Lars Ellenberg wrote:
> Subject: Re: [DRBD-user] DRBD demote/promote not called - Why? How to fix?
> On Thu, Nov 10,2016 at 13:21, 
> > On Thu, Nov 10, 2016 at 12:05:09PM +0000, CART Andreas wrote:
> >> I again started with all resources located at ventsi-clst1 and
> >> issued a 'pcs resource move DRBD_global_clst' (the resource next
> >> collocated next to the DRBDClone).
> >> 
> >> With that I end up with all primitive resources stopped and the
> >> DRBDClone resource still being master at ventsi-clst1.
> >
> > I don't think that has anything to do with DRBD,
> > (you'll see that when you try with some dummy resources instead).
> >
> > Just moving something "top of the dependency chain" won't move the
> > bottom of the dependency chain, especially not a Master role.
> > This is a Pacemaker shortcoming.
> I am pretty sure that's not generally true (although I'm new to DRBD
> and pacemaker and always willing to learn).

Prepare a cib with dummy resources (ocf:pacemaker:Dummy,
ocf:pacemaker:Stateful), and add similar constraints,
then start experimenting.

If you find suboptimal behaviour, you have a nice little example
you can show upstream when filing bug fix or enhancement requests
for how pacemaker "should" deal with certain situations.

If with dummy resources you find behaviour to significantly differ
from what you get with "real" resources, and the dummy setup behaves
"better" for your definition of better, you still have a nice example
to show how you "want" things to behave, and we can more easily look
into why things don't behave that way with "real" resources.

: Lars Ellenberg
: LINBIT | Keeping the Digital World Running
: DRBD -- Heartbeat -- Corosync -- Pacemaker

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