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Hi @full-train-34126, could you share support bundle, so we can do some troubleshooting first? Thanks.

Apologies, but the issue I'm seeing is with an air gapped installation, and I can't replicate it in our development cluster. I appreciate that isn't very helpful. I was hoping someone might recognise the symptoms, or have a special script to troubleshoot longhorn or something. If I generate the support bundle is there anything I can look for myself, and where should I be looking?

Well, a support bundle assembles a bunch of logs from many different pods which might help understand the problem. However, it is a bit too long to explain here in Slack. A first look at the upgrade process might help you go step by step in your troubleshooting: https://docs.harvesterhci.io/v1.4/upgrade/troubleshooting