I should also say that I have three other OWC USBC Thunderbay running RAID5’s. No problems there at all. Only with the PCIE card M.2 Raid 0.
Sonnett reached back out with the following:
”Hello Adam,
Thank you for the follow-up.
Our engineers have been working hard on this and have now been able to reproduce the issue. Just recently we were able to duplicate this issue with another competitor's hardware as well. From the data we have gathered from customers like yourself, and in our lab, it seems that an update released by Apple in the later 2023 time frame for multiple OS releases caused the issue with drives dropping off. We are trying to narrow down exactly which ones.
We have filed a bug report to Apple so that they can get the issue fixed in a future OS release.
If you would like, you can also try and submit your own Apple bug report, and reference the bug report we sent (FB13560165). More individuals reporting this may give more impetus to Apple to look into this more closely or more quickly.
We are sorry for the inconvenience and are working hard to get it resolved as quickly as possible. We have your case status listed as Waiting for Engineering Fix so that we can alert you once there is a solution.
As a partial solution in the interim, we have seen that installing the M.2 card/drives into an external Thunderbolt to PCIe chassis like our Breakaway Box, does resolve the issue of drives dropping off, albeit, bandwidth is limited to ~2750MB/s in the external chassis.
Let us know if any of this helps.
Thank you for your patience while we work through this.
Regards,
Sonnet Team”
