Single-node installation - Availability and upgrade
I have some questions related to single-node environment availability, and possibility to upgrade to multi-node.
I'm looking to newly install Qlik Sense Enterprise on premises. The plan is to start with a few users this year and scale up organically. I thought of starting with a single-node installation, since it's simpler, less admin overhead, and should be an ok option to support the firm in the first months.
Here's my concerns:
1. What can I do to improve availability of the single-node installation? E.g. what happens if there is an unexpected performance peak? Will the site go down and require manual server restart?
2. Is it possible to move to multi-node at a later stage? Is it even worth starting single-node?
What small to medium requirements, a single server is good enough. You can keep check monitoring apps to see consumption and when you feel that its hitting saturation you can plan to increase CPU/RAM to existing server and you can add a RIM node(while installing you choose option of joining an existing cluster).
If you are using a VM a proper backup mechanism can help you restore VM in no time in case of a crash. For a physical server you need to take regular backup(to restore you will need some downtime).