Re: [PATCH 2.6.13 5/14] sas-class: sas_discover.c Discover process (end devices)

Patrick Mansfield
2005-09-13T22:27:19Z

On Tue, Sep 13, 2005 at 05:02:36PM -0400, Luben Tuikov wrote:
> On 09/13/05 16:36, Matthew Wilcox wrote:
> > On Tue, Sep 13, 2005 at 04:23:42PM -0400, Luben Tuikov wrote:
> >
> >>A SCSI LUN is not "u64 lun", it has never been and it will
> >>never be.
> >>
> >>A SCSI LUN is "u8 LUN[8]" -- it is this from the Application
> >>Layer down to the _transport layer_ (if you cared to look at
> >>_any_ LL transport).

Not all HBA drivers implement a mapping to a SCSI transport, we have
raid drivers and even an FC driver that has its own lun definition that
does not fit any SAM or SCSI spec.

I think the only HBA's today that can handle an 8 byte lun are lpfc and
iscsi (plus new SAS ones).

So, we can't have one "LUN" that fits all, and it makes no sense to call
it a LUN when it is really a wtf.

-- Patrick Mansfield