From owner-freebsd-questions  Fri Mar  2 12:58: 3 2001
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From: "Siegbert Baude" <Siegbert.Baude@gmx.de>
To: "Riley J. McIntire" <rjmcintire@earthlink.net>,
	<chris@northernbrewer.com>
Cc: "FreeBSD Questions" <freebsd-questions@freebsd.org>
References: <NCBBLBILEPCHLFJAPIIPAEOIFFAA.rjmcintire@earthlink.net>
Subject: Re: Hot swap IDE device?
Date: Fri, 2 Mar 2001 21:57:45 +0100
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Hi,

> > Is there any way to get FreeBSD to add/remove an IDE device from a
> > running system?
> >
> > I'm experimenting with a $15 removable IDE hard drive kit. I would
> > ideally like to be able to power down the drive, remove it, insert
> > a new drive (possibly a different manufacturer/capacity), power it
> > up, and force FreeBSD to recognize the new IDE device.
> > Is this possible?
> > I assume I can swap identical drive models endlessly, and FreeBSD would
> > be none the wiser. However, two years down the road, it will be
impossible
> > to replace a broken drive with the identical model.

Artem Koutchine wrote:
> This is a bad idea. IDE is not a plug-n-play (or to say
> it right: HOT SWAP) bus.  You might disconnect
> a drive more or less safely, but reconnecting a drive into
> a working system can cause all kinds of troubles. And it
> has nothing to do with FreeBSD. It is related to
> electric schematic and interface standards. If you need
> hot swap try: SCSI, USB, FireWire??? drives.

Artem is right (maybe with the exception that I don´t believe SCSI to be
"hot swappable". Some disk arrays are, which are attached to a scsi bus as
one device.) your kit is designed to make changing IDE disks easy WHEN YOUR
COMPUTER IS POWERED OFF!
If there will be such a thing you´re talking about for 15$: Tell me!. Then I
want to have it, too. But I´m afraid the conception of IDE won´t allow this.
What I said for SCSI may be possible: a disk array, which does this, plugged
into IDE bus is imaginable, but for sure this will be not in the 15$ range!
So before changing your disk power off your computer and follow the advice
of some other guy to have the disk "no-auto" in fstab.

Ciao
Siegbert


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