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SubjectRe: devfs
Date
> > Yes, let's have one..
> >
> >>> bus 4 bits
> >
> > 16 controllers. OK...
>
> I'm thinking 4 cards with 4 busses on each card.

I think 4 bits are limiting too much. My disk array (which is the smallest
of its kind) has 6 busses 5 disks each. But there are much larger arrays.
>
> >>> LUN 8 bits
> >
> > 256 LUN's per SCSI ID? Gosh! 2.0.33 has 7 or 8 or 32 (depending on the
> > driver).
>
> Yes, available on some very expensive workstations.

Don't know how this is possible. LUN is always stored in the SCSI cmnd
block, and there are exactly 3 bits for it. So I think if somebody has more
than 3 bits, it means just that it is not actually different LUN, but
different target. Or am I wrong?

> >>> partition 6 bits
> >
> > 64 partitions per disk? Yikes! Few commercial OS's have that many
> > partitions per disk (Solaris allows 8), but OK... lets have 64 partitions.

Solaris allows 8, 'cause Sun disklabels are fixed sizes. If you use Sun
disklabels in Linux, you have the same limitation.

Cheers,
Jakub
___________________________________________________________________
Jakub Jelinek | jj@sunsite.mff.cuni.cz | http://sunsite.mff.cuni.cz
Administrator of SunSITE Czech Republic, MFF, Charles University
___________________________________________________________________
Ultralinux - first 64bit OS to take full power of the UltraSparc
Linux version 2.0.32 on a sparc machine (291.64 BogoMips).
___________________________________________________________________

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