Re: devfs

Michael Neuffer (neuffer@goofy.zdv.Uni-Mainz.de)
Mon, 12 Jan 1998 07:43:22 +0100 (MET)


On Sun, 11 Jan 1998, Leonard N. Zubkoff wrote:
> From: Michael Neuffer <neuffer@goofy.zdv.Uni-Mainz.de>
> Date: Sun, 11 Jan 1998 11:08:34 +0100 (MET)
>
> > 256 LUN's per SCSI ID? Gosh! 2.0.33 has 7 or 8 or 32 (depending on the
> > driver).
>
> Yes, that is indeed too high. There are 3 bit defined for this.
>
> 32 LUNs are actually used in practice in some installations, so limiting our
> device numbers is not really a good idea. 3 bit LUNs are only allowed in the
> CDB itself, but there are 6 bits actually available in the IDENTIFY message.
>
> I seem to recall that one of the newer SCSI specifications actually allows 8
> bits for LUN, but that doesn't apply to parallel SCSI.

Yes, you´re right. We have 8 bits in the serial SCSI specs.

Mike