Add a non-HA node to a HA cluster

[Aleksandrs]

We have a 3-node HA cluster with an FC SAN storage.
There is a server with no connection to the SAN.

Is it possible to add the server to the cluster as a non-HA node, to take advantage of centralized management, and later, when we add an FC adapter to the server and connect it to the SAN, convert it to a HA node?

 

[tom]

yes.

 

[Aleksandrs]

So, how do I it the right way?
Is it the fencing that turns a node into a HA-node?

 

[tom]

if you want HA, you need the following:

http://pve.proxmox.com/wiki/High_Availability_Cluster#System_requirements

if only two nodes got access to the SAN, you just need to configure your storage and your HA enabled VM that they can just run on these two nodes (via failover domains).

if your 3rd node can access the SAN in future, you just need to adapt your storage config and if you want, also your fail over domains.