Re: iSCSI Boot: Technical Issues

[Mark Bakke <mbakke@cisco.com>]

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