This is latest version of savecore from work computer that is using gmirror
It did finally savecore after a panic, but something isn't right with it
restoring balance afterwards.

Since its newer than my last commit, I'm updating it here....so far haven't
had a panic to test it.

Also one of my drives has failed (might be why it was panic'ng a lot recently.)

So, balance is irrelevant at the moment.