Subject: Re: differential scsi controllers
To: None <current-users@NetBSD.ORG>
From: Paul Ripke <>
List: current-users
Date: 07/03/1998 11:53:31
Thus spoke Tim:
> On 01-Jul-98 Thor Lancelot Simon spoke unto us all:
> #  Even if it worked, it wouldn't be worth using.  It's absolute idiocy --
> #  mirroring for the sake of being able to say you're mirroring.  It always
> #  reads from the first component of a mirror set, thus giving no performance
> #  benefit, and it doesn't handle errors *at all*, meaning that an error on
> #  either component will cause the halves of the mirror to become inconsistent,
> #  so that is very unlikely to provide redundancy, either.  It's Awful.  It
> #  should have been removed Long Ago.
> I hate to say it, but AIX has a really nice software mirroring.  If the drive
> in question bites it, it does a few things:
> <snip>

And then there's VMS - I can't say how many disks we've lost and
replaced without downtime. VMS shadowing is remarkably simple,
reliable, and integrates well with VMS's notion of clustering.

So, when do we get clustering for NetBSD? ;)

Paul Ripke
BHP Information Technology
OpenVMS & UNIX (AIX, DG/UX, SCO, IRIX, Digital, SunOS...) Sysadmin
Computer Centre, Five Islands Rd, Port Kembla, NSW 2505, AUSTRALIA
      Anyone wishing to lay claim to the opinions expressed
                herein, do so at their own risk.