[DRBD-user] DRBD and ProxMox asymmetric cluster

Alexander Trilissky alexander.trilissky at gmail.com
Thu Aug 9 14:07:33 CEST 2018


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

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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