For the last few weeks I’ve noticed that my Mac Pro (late 2013, cylinder style) has been sluggish, mouse skipping, video playback choppy. After a reboot it seemed to be fine for a while but then it slowly went back to this behavior. I couldn’t right out say what was the cause and there were several things that happened at once that it could have been. The storage replacement and new OS happened around the same time because one relied on the other. And to add to it, during a shutdown request (or reboot) the system would always reboot and show a shutdown error. Checking the logs gave me to the clues to try and resolve.
When trying to find out why NVME was causing a kernel panic on shutdown, I was lead to the solution – unfortunately it required a reformat of my main system disk. I did everything I could to avoid having to do that, but in then end it was the cleanest and so far the best solution. The issue was due to an error that was being reported when I check the APFS container. It would always say everything appears OK with the drive, but there was a line in the results that would indicate an over allocation. Basically the drive within the container said it had a bit more space than was physically possible. The only way to fix that was a reformat of the OWC Aura Pro X SSD. It was a bit of a pain, but with an up to date Time Machine backup, the worse part was the 2 hours or so it took to get back to a working system. Overall it was an easy thing (at least for me) and it seems to be much more stable than before. I’ll be putting a pretty big load on the machine today to test things out and see how much of the 64GB of memory I can use with running apps.