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From
SubjectRe: SCSI device numbering
Date
Followup to:  <m0uakow-00020gC@kb5yvf.usl.edu>
By author: jms@pobox.com (Johnie Stafford)
In newsgroup: linux.dev.kernel
>
> ac> Purpose Bits Normal Extreme
> ac> controller 4 <= 1 2
> ac> bus 4 == 0 1

Extreme known is 3, actually.

> ac> device 8 <= 2 4
>
> What about wide SCSI? It does 16 devices.

Actually he is allowing up to 256 devices here (2^8). 3 bits would be
normal, 4 wide, and SCSI-32 would require 5 bits.

> ac> lun 8 == 0 3
> ac> partition 4 <= 3 4

This is inadequate. The 4-bit partition limit in SCSI has shown too
restrictive.

However, since Linus is suggesting using the major for the controller
(a very good idea, IMHO) 12+20 should be enough. I still would prefer
32+32.

-hpa
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