I got the replacement drive and dropped it in. Reconstruct was looking good. This morning, all drives are asking for overwrite confirmation. I’m guessing that the array had another fault during reconstruction. Another victim of RAID-5 Achilles heel? For the love of Patterson, Gibson and Katz there has to be a better way. Advanced erasure encoding? Josh Coates’ Distributed Reed-Solomon encoding? The backup barely started, so I’m hoping that the array isn’t toast. Based on experience I expect that it is.
Investigation after the turkey break!