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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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