tie-braker node promotion

[Rene Peinthor]

https://linbit.com/drbd-user-guide/drbd-guide-9_0-en/#s-configuring-quorum-tiebreaker

On Fri, Mar 8, 2024 at 4:51 PM Josh Fisher <jfisher at jaybus.com> wrote:

>
> On 3/7/24 04:40, Boris Tobotras wrote:
>
> Hi drbd users,
>
> I’ve set up a two-node configuration, and it works as expected protecting me from the single node failure.
> Now I want to also be protected against network failure — and the resulting split brain state.
> I’ve added a third diskless node to serve as a tiebreaker. Now when I’m testing working node failure, I’m
> sometimes getting this third node promotion to an active one.
>
>
> I believe that you need 3 replicating nodes to use quorum. Diskless nodes
> do not participate in quorum, since they do not themselves have a copy of
> the replicated data and so cannot vouch for its validity.
>
> An alternative is to add redundancy to the network itself.
>
>
> The configuration is as follows:
>
> resource "data" {
>   device minor 1;
>   disk /dev/sda;
>   meta-disk internal;
>   on "worker1" {
>     node-id 0;
>     address 172.16.3.113:7789;
>   }
>   on "worker2" {
>     node-id 1;
>     address 172.16.3.114:7789;
>   }
>   on "breaker" {
>     node-id 2;
>     address 172.16.3.115:7789;
>     disk none;
>   }
>   connection-mesh {
>     hosts "worker1" "worker2" "breaker";
>   }
> }
>
> What am I doing wrong here?
> Can DRBD be configured so the diskless node never gets promoted?
> Or is there another way to get what I need?
> Thanks a lot in advance!
>
>
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