Linux-kernel mailing list archive 2000-26,: Re: IDE hot-swap kernel support

# Re: IDE hot-swap kernel support

Andre Hedrick (andre@linux-ide.org)
Fri, 30 Jun 2000 13:50:14 -0700 (PDT)

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If you want empty bays at boot, then there needs to be code that handles
the exception. You yank a device out of some hosts and boot and the host
is never loaded. You are now talking about a re-init process to wake-up
and INT19 hook some the the add-on cards with BIOS to the Mainboard BIOS.
That will get UGLY.

On Fri, 30 Jun 2000, Andrzej Krzysztofowicz wrote:

> >
> > The problem comes when I swap drives. A BLKRRPART causes it to read
> > the new partition, and the new drive works. However, it does not read
> > the new drive geometry, so fdisk gets rather confused. Switching from
> > a small HDD to large one and accessing the end of the large drive
> > *seems* to work. Another problem is that if the system is booted with
> > no disk in the bay I can't get it to recognize a disk which is
> > inserted later.
> >
> > It seems to me that what I need is a way to stimulate the ide driver
> > to reprobe for a drives on an ide bus. From looking at
> > linux/drivers/ide-probe.c, I don't see any way to manually trigger a
> > probe. Perhaps one should be added - 'echo 1 > /proc/ide/ide1/reprobe'?
> > Or even 'echo slave > /proc/ide/ide1/reprobe'?
>
> There's an ioctl() already in ide.c - HDIO_SCAN_HWIF.
>
> Unfortunately it is not stable enough and have some other limitaions.
> Maybe /proc interface would be better for that... Andre ?
>
> > Thoughts?
>
> --
> =======================================================================
> Andrzej M. Krzysztofowicz ankry@mif.pg.gda.pl
> phone (48)(58) 347 14 61
> Faculty of Applied Phys. & Math., Technical University of Gdansk
>

Andre Hedrick
The Linux ATA/IDE guy

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