Dear Shine, Thanks for the information!  I saw some other posts that described similar long rebuild times, so for now I am just going to leave it alone.  There is not much I/O activity (the drive lights are not flashing rapidly), and the server is not heavily loaded, but what I DO know is that it appears to be making progress, and I know the golden rule in manufacturing "IF IT AIN'T BROKE, DON'T FIX IT!!". Thank you for your help and advice! Larry
I think I goofed up - I had a drive in predicted failure - not yet failed - and I pulled it out to hot-swap a replacement. Now the new drive will not rebuild.  I was reading the other posts and I suspect I should have set it "Offline" first.  How do I recover from my mistake?
Hot-swapping a drive in a state of predicted failure