Re: IDE and hot-swap disk caddies

Andre Hedrick (
Wed, 27 Mar 2002 16:11:13 -0800 (PST)

On Thu, 28 Mar 2002, Itai Nahshon wrote:

> On Thursday 28 March 2002 00:51 am, Alan Cox wrote:
> > > I have seen USB mass storage devices with ide connector on them, so it
> > > is certainly possible to translate between scsi and ide. If it makes
> > > sense from performance standpoint.... I don't know.
> I have one of these. The performance that I get is really poor and there
> are some quirks but it is still useful. I will be _very happy_ when I will be
> able to use it for system installation/upgrade (which did not happen yet).
> >
> > SCSI->IDE command translation isnt too hard providing you stick to simple
> > stuff and blindly ignore things like ATAPI, SMART, and all the control
> > stuff. The moment you get into the complex stuff its deeply unfunny.
> >
> What are the prospects of seeing SCSI and IDE code (and internal
> programming interface) unified? How much can be unified until
> performace considerations and code complexity mandates a separation?

Very easy if several issues are fixed, and that is the stumbling point.
I would require strict compliance to the standards, faking all the missing
parts of each transport layer, and abstraction of the all capabilties to a
comman caller/interface.

Oh and make every transport protocol support their own error recovery.


Andre Hedrick
LAD Storage Consulting Group

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