Please advise: Add third node to a two node cluster

LINSTOR
,
1

I’ve setup a two node proxmox cluster with linstor drbd as cluster storage.

2x Hosts, 2TB nvme storage, 2.5Gb NIC

Works like a charme - except some issues with the new 6.17 kernel.

Now I like to add a third node.

Same hardware config without destroying the storage config.

I just like to extend the current config, so the third node also synchs the cluster data.

Is there a how to?

Thanks in advance.

commands and command output, configuration file contents, log messages, and other such CLI content
2

Simply build the third node and add it to the cluster in the same way as you did for the second node. That means adding a Proxmox cluster node, and linstor node add... for linstor.

When you say “the third node also synchs the cluster data”: if you’re talking about the Proxmox cluster database (/etc/pve), this is automatically synced to all nodes in the cluster when you add the extra node. If you have any problems in this area, you should ask on a Proxmox forum.

If you mean you want three replicas of your DRBD volumes, then you change the PlaceCount on your resource group. Presumably you had set it to 2 before; now set it to 3.

# check what you have
linstor resource-group list

# modify
linstor resource-group modify --place-count 3 <name-of-resource-group>

# see where your volumes are placed and the replication state
linstor volume list
3

Thanks for the quick reply - works like a charme :slight_smile:

Three nodes are better than two :smiley: