I was previously on CORE 13.3. I Upgraded to 24.04 easily and had no problems. When upgrading to 24.10 however, it breaks one of my pools, messes with 22/24 disks in the pool, and they start showing random numbers when looking at them in the UI instead of the sdXX designators. My first pool stays fine though.
The second pool, that breaks, is connected through an LSI card.
You really need to post details by what you mean. Maybe some screenshots.
If you can’t post images, browse some other threads. Look for 24.04 to 24.10 issues on upgrading. Some of those may help if similar.
You can also do the Tutorial by the Bot to get your forum trust level up to allow image posting.
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Type this in a new reply and send to bring up the tutorial, if you haven’t done it already.
@TrueNAS-Bot start tutorial