Subject: Re: System unique identifier.....
To: Wilko Bulte <>
From: Matthew Jacob <>
List: tech-kern
Date: 06/25/1999 14:38:04
Yes, you want the WWN to stay constant. That doesn't mean it should
necessarily be the same physical box. Nor does it mean it should be a
system that comes with a WWN assigned to by the manufacturer.

I think I'm confusing myself and people. I have a WWN. By definition it
should be unique value. All I'm asking for is a kernel function to help me
generate such a thing (despite what Eduardo says).

On Fri, 25 Jun 1999, Wilko Bulte wrote:

> As Matthew Jacob wrote ...
> > > 
> > > FYI: The Compaq HSG80 Fibrechannel RAID controllers have their 
> > > WWN in NVRAM. One is supposed to get the WWN from a label on the *cabinet*
> > > into the HSG controller. This allows for easy hardware swap in case of
> > > hardware grief.
> > 
> > Yes, if you want the WWN to stay constant.
> Well, you do. Especially when you are using things like zoning (like
> that Brocade switches can do) or when the host directly ties things to
> the wwn it talks to. E.g. for connection to Sun we use Jaycor adapters
> that allow things like "target=foo lun=bar www="<64bitnumber>" in the
> Solaris /kernel/drv/sd.conf file

And to boot a Sun over fibre channel, you use the WWN.