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SubjectRe: IDE and hot-swap disk caddies
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At the interface level, there is some support.
Look at hdparm's -b option to tristate the bus.
But that's the whole bus. If the controller implements
master/slave on one cable, you're hosed, electrically.
It's the whole interface. 95% of controlers are like this.

Intel's PIIX can do master/slave on separate ports, but
then you loose one bus. Laptops with bays also do things
like this, but that's special hardware, hard to get programming
specs for.

I think if you add the drive *after* boot, it doesn't
have the benefit of the BIOS setting up PIO/UDMA modes,
so I would try the hdparm -X speed settings also.

Jeremy

----- Original Message -----
From: "John Summerfield" <summer@os2.ami.com.au>
Sent: Monday, March 25, 2002 3:16 PM
Subject: Re: IDE and hot-swap disk caddies

> > > The device is hot-swap capable and has a switch (others have a key)
> > > that locks the drive in and powers it up; in the other position the
> > > drive is powered down and can be removed.
> >
> > Linux doesn't support IDE hot swap at the drive level. Its basically
> > waiting people to want it enough to either fund it or go write the code
> >
>
> What needs to be done? How extensive is the surgery needed?

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