Tried to submit a support case, but the site errored:
A system error was encountered during your request. If you need to contact us, please make sure to report the error number below to us. Error number: 26821268
so I’m submitting it here in hopes that maybe the issue I’m having with my drive is a known issue.
I have a Late 2014/Early 2015 Mac Mini with 3 GHz Intel Core i7, 16 GB of RAM, and OS X 10.10.5. I am booting from the internal SSD and using my Thunderbolt Velociraptor Duo in RAID 1 mode for my home directory and other important files. I have had zero trouble with it until 48 hours ago. Now, for the second time, I’ve put my Mac to sleep at night, and when I woke it up in the morning, the Thunderbolt Duo was running in degraded mode and started automatically rebuilding the array. SMART status passes. I haven’t done any O/S upgrades in the past 48 hours or installed any new drivers or anything else that would explain why it suddenly started doing this. I might expect this behavior if the system unexpectedly powered off (it’s on a UPS, though) or if I unplugged the drive without ejecting it, but none of those is the case.