Hi All,
Bob Frey wrote:
>
> Hi Patrick,
>
> You're right, I was thinking of the HiSup bit. But as you point out
> it only indicates a device supports Hierarchical Addressing and that
> it must support REPORT LUNS. I incorrectly inferred that a device with
> a HiSup bit of zero will not support REPORT LUNS.
>
> I don't see a better way to detect LUNs other then to first try REPORT LUNS.
> If a CHECK CONDITION is returned from REPORT LUNS, then start LUN scanning
> with an INQUIRY.
>
FWIW: This is the correct way, and how we do it on Tru64 Unix.
-Robin
> --
> Bob Frey
> [EMAIL PROTECTED]
>
> On Thu, Mar 15, 2001 at 12:07:46PM -0800, Patrick Mansfield wrote:
> > Bob -
> >
> > What bit are you referring to?
> >
> > The spec seems to say that if the HISUP bit in the inquiry page is not set,
> > the device can still support the REPORT LUNS.
> >
> > The SCSI Primary Ccommands - 2 (SPC-2)
> > ( ftp://ftp.t10.org/t10/drafts/spc2/spc2r19.pdf ) page 103 in describing
> > INQUIRY fields says:
> >
> > A hierarchical support (HISUP) bit of zero indicates the target does not use
> > the hierarchical addressing model to assign LUNs to logical units. A HISUP bit
> > of one indicates the target uses the hierarchical addressing model to assign
> > LUNs to logical units. WHen the HISUP bit is one, the device server shall
> > support the REPORT LUNS comman (see 7.19). When the HISUP bit is zero, the
> > device server may support the REPORT LUNS command.
> >
> > So, it seems a REPORT LUNS could still be supported by a "sparse LUN" device
> > that has HISUP set to zero.
> >
> > -- Patrick Mansfield
> -
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