Re: IDE/ATAPI in 2.5

[Joerg Schilling]

>From: Rik van Riel <[e-mail]>

>> Well, I get pissed of the fact that it seems to be impossible to have a
>> technical based discussion in the Linux kernel environment.

>Then please, show us your technical arguments on why the SCSI
>layer is enough for every CD writing hardware out there.

Simple: there is not a single CD writer out that uses something other
than SCSI commands to write media or do DAE.

>Now compare them with the results from the NAS and SCSI talks
>and BoFs at the kernel summit and OLS, where everybody agreed
>that the current SCSI addressing and discovery schemes just
>don't cut it on things like iscsi and other network storage
>solutions.

I defined RSCSI before iscsi came out. I did not yet look at ISCSI.
There sould be just an additional IP address in the iscsi addressing
model.

>It's not just about the fact that the controller/bus/unit/lun
>addressing doesn't deal well with network attached storage and
>multipath, it's also about things like the impossability of
>device discovery on a bus with 2^32 possible device addresses.

You don't need as you might net be allowed to access many of them.
Just have a look at my RSCSI protocol. It just puts "user@host:"
before the old SCSI address.

>This, in turn, makes the current sd[a-z] and sg[a-h] more than
>a little inadequate.  Furthermore, you suddenly require the
>ability to tell the kernel to talk to devices the kernel doesn't
>yet know about (because it can't scan 2^32 device addresses at
>boot time).

You are right, but this is what programs like e.g. cdrtools which use
libscg already do for two years.

Jörg

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