All our raids are RAID6 so at least we have that comfort. We also run everything on UPS to smooth out any power spikes/dips.

We did have a dying drive that we replaced a week ago on that raid, although I was getting those Open-E error messages before that drive was reporting a problem.
The logs in the Areca controller card don't report anything wrong either.

Is it worthwhile to send you the Open-E logs? If so, please PM me your e-mail address.

This brings up another question I've been wondering: Is there any preventative maintenance I can do to make sure my raids are as healthy as they can be?

Thanks again for your help and advice!