This sleep issue has been around for so long I can't remember. At least 10 years. Maybe the entire 10.x cycle.

@joemikeb

Was there a kernel panic report you were able to capture?

Sorry about this, this has been around since 2014, actually since day one of Thunderbolt being added to the Mac. I was hoping it was fixed!

It appears Apple thought it was fixed but obviously not. There was no kernel report generated, just SoftRAID and CCC reporting failure. My Feedback Assistant report has been updated along with an updated Sysdiagnose report. I am back to the workaround with Energy Saver Prevent your Mac from automatically sleeping ON and Put hard disks to sleep when possible OFF. With those settings both SoftRAID and Carbon Copy Cloner are completely reliable. NOTE: Some of the drives used by CCC are connected via the USB 3.0 ports on my M1 Mac mini and do not go through the Thunderbolt 4 ports. FWIW, I recall similar external drive timeout  issues in the early days of OS X preceding the advent of Thunderbolt that were amenable to the same workaround.

@joemikeb

A: see my prior query about Time Machine

B: What is the expected behavior with Launchpad? (I never use it) Can you add it manually? It does not seem that this is a SoftRAID controlled behavior.

Launchpad, when launched displays the icons for all applications installed in /Applications and the application can be launched by clicking on it icon in Launchpad. In this case, and for whatever reason, the only app that refused to show up was SoftRAID. That was corrected in SoftRAID 6.2. 🤷‍♂️

Was there a kernel panic report you were able to capture?

Sorry about this, this has been around since 2014, actually since day one of Thunderbolt being added to the Mac. I was hoping it was fixed!

No joy. 😫  After re-enabling put hard drives to sleep when possible and disabling Prevent Mac from sleeping when display sleeps, when I came in this morning there was a message that one of the drives in my array had failed. Additionally Carbon Copy Cloner backups had failed because "the target drives were not available" and the system had restarted during the night. So it appears that not only is the error not fixed, if anything, it is worse.

FYI the Feedback Assistant report number is FB9362019

Note: as long as Put hard disks to sleep is disabled and prevent Mac from sleeping is enabled everything is rock solid stable.

Thanks, I will enquire and start doing some testing on this. It is hard to reproduce on clean systems, but if I gather enough enclosures, I should be able to get ejects.

None of the above, it was addressed to me with a reference to my Feedback Assistant post

Did you hear from a specific person? Or did they give you a "radar" number, or just a case number?

We have not been informed yet, I will check, that would be excellent news.