Re: SCSI disk devices

Michael Neuffer (
Tue, 13 May 1997 20:59:18 +0200 (MET DST)

On 9 May 1997, Matthias Urlichs wrote:

> Martin von Loewis <> writes:
> > The remaining question is how to divide the 64 bits between major and minor
> > number. Linus claims this is not an issue. I don't agree, because file
> The kernel still has to dispatch to the driver based on the major number.
> Anyway, I'd use 16 bits major and 48 bits minor. That's enough space for
> drivers and enough bits for all SCSI buses you're ever going to find on a
> system (let's see, 8 adapters with 4 channels with 16 devices with 8 LUNs (oops,
> more for SCSI-3?)

There are adapters around with >4 channels. 5 was the highest I've seen
so far.

Also will soon need to start supporting >16 devices. 128 will be
needed when using SSA controllers for example.