Re: iSCSI Boot: Technical Issues

[Mark Bakke <mbakke@cisco.com>]

Julian-

I agree on not adding LUN structure text; it's just too scary
for one thing, and like you said, it's not the only one.

If we can just say 0s to the right, that's fine with me.

Thanks,

Mark

Julian Satran wrote:
> 
> Mark,
> 
> Carefully. You may want to add the "0s to the right" as this is practical.
> But don't add the LUN structure text. It is not always so. There are several types of LUN
> structures...
> And I am sure you don't want to go there.
> 
> Julo
> 
>   Mark Bakke <mbakke@cisco.com>
>   Sent by: owner-ips@ece.cmu.edu         To:        Luben Tuikov <ltuikov@yahoo.com>
>                                          cc:        Prasenjit Sarkar/Almaden/IBM@IBMUS,
>   23/09/02 15:31                 ips@ece.cmu.edu
>                                          Subject:        Re: iSCSI Boot: Technical Issues
> 
> 
> 
> Oh, yes, I forgot to specify that.
> 
> Actually, it should be "unspecified xxxx to the right are
> all zeroes".  The reason is that the LUN field is not a
> number; it is a structure.  The first two bytes are the
> first-level LUN; the second two are the second-level LUN,
> and so forth.  It's meant to allow a gateway to take, for
> instance, a group of targets, each with their own LUNs,
> make the original LUNs second-level LUNs, then make up its
> own first-level LUN for each target.  These can be used
> in other ways as well.
> 
> This all means that when specifying a first-level LUN, it
> would be (let's say LUN 4) 0004-0000-0000-0000.  So saying
> they are unspecified to the right would be the way to go.
> 
> --
> Mark
> 
> Luben Tuikov wrote:
> >
> > --- Mark Bakke <mbakke@cisco.com> wrote:
> > >
> > > Multiple-level LUNs (defined in 4.9.4) use as many xxxx
> > > fields as
> > > they need (e.g. xxxx-xxxx, xxxx-xxxx-xxxx, and
> > > xxxx-xxxx-xxxx-xxxx
> > > are all valid; unspecified xxxx are zeroes).
> >
> > More formally: `` ... unspecified xxxx to the left, are
> > zeros.''
> >
> > --
> > Luben
> >
> > =====
> > --
> >
> > __________________________________________________
> > Do you Yahoo!?
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> > http://sbc.yahoo.com
> 
> --
> Mark A. Bakke
> Cisco Systems
> mbakke@cisco.com
> 763.398.1054

-- 
Mark A. Bakke
Cisco Systems
mbakke@cisco.com
763.398.1054