[DRBD-user] DRBD and ProxMox asymmetric cluster

[Yannis Milios]

This has to be asked in PVE mailing list, nothing to do with DRBD.

Check PVE documentation for how HA works (keyword: nofailback).

AFIAIK PVE's HA manager has no way to interact with the underlying storage.
It will just attempt to start the resource wherever you have set it to do
so.If the undetlying storage (DRBD in this case) is ready to do that, it
will do it. I assume you are using DRBD8 in dual primary mode (with all
risks that implies, if improperly configured).




On Thursday, August 9, 2018, Alexander Trilissky <
alexander.trilissky at gmail.com> wrote:

> Hello!
>
> I have an asymmetric ProxMox 5.2 cluster with two main nodes (node-A and
> node-B) and one small qorum node (node-C).
>
> My aim is to get a HA cluster with DRBD-driven storage on main nodes. It
> should act as follows:
>
> 1)    In working state all nodes are up, DRBD resources are UpToDate,
> guest VM is running on one of main nodes.
>
> 2)    When Passive main node (B) fails, guest VM works as usual on Active
> main node (A). When Passive main node restores, DRBD resource synchronizes
> automatically.
>
> 3)    When Active main node (A) fails, PM HA restarts guest VM on Passive
> Main node (B).
>
> And now the interesting:
>
> 4)    If the rest main node (B) fails or was gracefully shut down, and
> after that we start the first main node (A), PM HA starts guest VM on
> this node with old data on disk. So we lost data changes on the main node
> B.
>
> Is there any way to allow PM HA to start guest only on the node with last
> activated resource in case of not fully mashed cluster, and to disable this
> if the node has old replica? Is third small node can help with it?
>


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