Subject: Re: differential scsi controllers
To: Erik E. Fair <>
From: Perry E. Metzger <>
List: current-users
Date: 07/01/1998 11:15:28
"Erik E. Fair" writes:
> At 13:48 -0700 6/30/98, Michael K. Sanders wrote:
> >I was asking (on other lists) more for general opinions on the
> >benefits of differential SCSI, and if mirrored CCDs were 'safe'.
> Um, I have an open PR on the CCD mirror stuff (kern/3765) - it blew up
> quite consistently on me on NetBSD/sparc on a sun4m (SPARC Classic).
> Everyone here reports that the non-mirrored uses of CCD work. I'm actually
> gearing up to try it again, now that UVM is default on sparc.

"Don't bother".

It is known that CCD mirror doesn't work -- I even believe that Jason
was going to yank it out, because he believes his code isn't worth
fixing as is. We are now moving towards using RAIDframe for this, or
so I am told.