Re: IDE Disk speed enhancements

Marty Leisner (leisner@sdsp.mc.xerox.com)
Wed, 24 Apr 1996 08:26:20 PDT

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> The ATA (IDE) specs do not permit overlapped disk transfers within
> a single interface. But, as already noted, requests to disks on
> separate interfaces can be overlapped. Linux has done this since
> kernel revision 1.1.76 or so.
>
> The same treatment applies, regardless of whether PIO or (triton) DMA
> is being used on any given interface. (the Triton chipset counts as
> two interfaces, ide0 and ide1).
>
> IDE tapes using the latest ATAPI enhancements can overlap operation
> with an IDE disk on the same interface under Linux. Some cdroms may
> also have this capability, but not yet with Linux.
>

So it would make sense to configure two disks as /dev/hda and
/dev/hdc, instead of
/dev/hda and /dev/hdb?

I've never seen this written anywhere...

-- 
marty
leisner@sdsp.mc.xerox.com  
Member of the League for Programming Freedom

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