[DRBD-user] Proxmox:Linstore, new third node, all volumes diskless, why?

[Rene Peinthor]

If you want diskful replicas on all nodes, you also need to change your
place-count on your used resource group.
Otherwise it will always only be diskful on 2 nodes (which ones are decided
by linstor).

Cheers,
Rene

On Thu, Dec 3, 2020 at 7:33 AM Gábor Hernádi <gabor.hernadi at linbit.com>
wrote:

> Hi,
>
> > But all the volumes are now and remain in diskless state on Hydra1?
>
> when you added the third node, the command `node create Hydra1` triggered
> Linstor's auto-tiebreaker feature. DRBD can use quorum[1] (useful if your
> cluster gets split), but needs 3 peers for that (so there can be a majority
> of still connected nodes, which is kinda difficult with only 2 peers). That
> is the reason why Linstor automatically deploys all resources where you
> already had 2 diskful replicas to the third as diskless peer. You can also
> check the .res files to see that quorum is now active on all your
> DRBD-resources.
>
> A Linstor-managed tiebreaking resource is by default hidden/filtered in
> the `resource list`. You can still show them with `resource list --all`.
>
> > But in the end the DRBD-Device is still diskless on Hydra1
>
> That will also stay this way until you tell Linstor to do something
> differently.
>
> > How do I get the volumes also DRBD-replicated onto the third node?
>
> Usually Linstor complains if you try to create a resource while the
> resource is already deployed on the given node ("resource already exists"
> or something like that).
> However, Linstor's tiebreaker is different as that one allows you to
> either `resource create Hydra1 $resource -s ...` or do a `resource
> toggle-disk Hydra1 $resource -s ...`, whereas for the special case of
> Linstor tiebreakers, the first method will internally be mapped to the
> second one :)
>
> For me everything looks normal / as expected.
>
> Best regards,
> Gabor
>
>
> [1]
> https://www.linbit.com/drbd-user-guide/drbd-guide-9_0-en/#s-feature-quorum
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