As Matthew Jacob wrote ...
> 
> 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.

Manufacturers have to register and 'get' a unique range they can assign
to their products. How do you guarantee that your homegrown WWN is
really unique?

> 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.

Well, we currently don't support that, but indeed that is what you would
do. Tru64 Unix does something similar.

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