# Please advise: Add third node to a two node cluster

**URL:** https://forums.linbit.com/t/please-advise-add-third-node-to-a-two-node-cluster/1063
**Category:** LINSTOR
**Tags:** drbd, proxmox
**Created:** [November 19, 2025, 8:33am UTC](https://forums.linbit.com/t/please-advise-add-third-node-to-a-two-node-cluster/1063 "2025-11-19T08:33:14Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![pme242](https://avatars.discourse-cdn.com/v4/letter/p/3bc359/32.png) [@pme242](https://forums.linbit.com/u/pme242)
#### Post date: [November 19, 2025, 8:33am UTC](https://forums.linbit.com/t/please-advise-add-third-node-to-a-two-node-cluster/1063/1 "2025-11-19T08:33:14Z")

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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.

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

```

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### Author: ![candlerb](https://avatars.discourse-cdn.com/v4/letter/c/c5a1d2/32.png) [@candlerb](https://forums.linbit.com/u/candlerb)
#### Post date: [November 21, 2025, 8:09am UTC](https://forums.linbit.com/t/please-advise-add-third-node-to-a-two-node-cluster/1063/2 "2025-11-21T08:09:10Z")

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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.

```sh
# 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

```

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### Author: ![pme242](https://avatars.discourse-cdn.com/v4/letter/p/3bc359/32.png) [@pme242](https://forums.linbit.com/u/pme242)
#### Post date: [November 27, 2025, 9:21am UTC](https://forums.linbit.com/t/please-advise-add-third-node-to-a-two-node-cluster/1063/3 "2025-11-27T09:21:18Z")

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Thanks for the quick reply - works like a charme 🙂

Three nodes are better than two 😃