Re: (Semi)hot swap IDE

From: Jez Hancock (jez.hancock_at_munk.nu)
Date: 11/24/03

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    Date: Sun, 23 Nov 2003 23:57:19 +0000
To: questions@freebsd.org

    On Sun, Nov 23, 2003 at 01:16:50PM +0200, Toomas Aas wrote:
    > > 1. The 'generic' removeable drive trays for IDE that use a normal IDE
    > > controller (like attaching to the slave or secondary channel on most
    > > onboard IDE), with another disk or device attached that's being used, do
    > > not support removeable devices. It's _extremely_ likely that you'll
    > > hang the IDE bus.
    >
    > If there is only CD-ROM (which is almost never used) attached as
    > primary master and the removable disk attached as secondary master then
    > maybe I don't need to worry too much about that.

    Just for the record I have the kind of setup you're talking
    about - I successfully 'hot swapped' a 40Gb IDE disk using a hdd
    caddy tray but there are caveats (mostly highlighted above) - using the
    term 'hot swap' loosely here because it just doesn't feel too clever
    doing it :P

    I found the following:

    - I could remove/reinsert the device only if it was originally in the machine on
      boot - this is fairly obvious I suppose. Otherwise the device just
      doesn't show up.

    - I could re-insert the device successfully but only if I'd umounted it
      first before removing it.

    - Removing the disk without umounting produced random results -
      sometimes the disk could be re-inserted ok, other times not, as the
      previous poster mentioned the IDE controller appears to hang.

    For the record iirc the disk was attached to the secondary ide
    controller with a hdd and a cdrom drive on the first ide controller.

    Best thing is to play - doesn't make as much noise (or smoke) as
    hot-swapping PCI cards! 

    -- 
Jez Han***
 - System Administrator / PHP Developer
http://munk.nu/
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