Re: [PATCH] zfcp: Report FCP LUN to SCSI midlayer

[James Bottomley <James.Bottomley@SteelEye.com>]

On Thu, 2007-06-21 at 21:40 -0700, Mike Anderson wrote:
> James Bottomley <James.Bottomley@SteelEye.com> wrote:
> > A proposal to display the correct form of the LUN would be useful if you
> > wish to make it? ...  The problem is really that SAM specifies a
> > possible 4 level structure with 4 possible address methods per level.
> > 
> > The well known LUNs should be simple; there are only three: Report Lun,
> > Access Controls and Target Log Pages.  The rest we really need input on.
> > For instance, I could see the vendors wishing us to combine a
> > multi-level flat addressing space into a single logical unit number,
> > whereas I could see them wanting us to supply some sort of hierarchy for
> > the peripheral and logical unit methods of addressing.
> > 
> > Since you're already using 2 level flat addressing, how do you want to
> > see that represented?
> 
> James, why would we would not want to display the lun per SAM4 4.6.2 as
> suggested by Stefan in a previous comment.

Because in a two LUN system, what was LUN 1 would then become LUN
0x1000000000000 which looks a bit unpalatable.

James