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I've had all sorts of strange issues with Longhorn. The most recent is when I tried upgrading (via Rancher UI) from 1.5.3 to 1.6.2. It looked like the upgrade went fine, but I couldn't attach any volumes the next day. The v1 data engine box wasn't checked by default. Every time I checked the box in the settings, the next day it was reverted. So I tried going back into Rancher Apps to edit the config and redeploy, but it failed saying that Longhorn was still upgrading. This was like a week later with everything indicating the Longhorn was at 1.6.2 and I did not see any reason why it would still be updating. I have not figured it out yet. Luckily this is just our test cluster, if that happened in prod I'd have hundreds of angry users. Sorry, wish I could help, we put off any Longhorn upgrades exactly for these reasons

It's all good