[ltp] raid1 on thinkpad A31

[Reed Gregory]

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On Tuesday 17 February 2004 12:57 pm, Jon wrote:
> > On Tuesday 17 February 2004 11:55 am, Andy Firman wrote:
> >> I just learned how to run a full system on Linux software
> >> RAID1 and would like to do this with my Linux Thinkpad.
> >> (i.e. root on raid1)
> >>
> >> My question is about IDE controllers on Thinkpads.
> >>
> >> /dev/hda is my first 40GB IDE drive.
> >> /dev/hdb is my second 40GB IDE drive.
> >> /dev/hdc is my cdrom.
> >>
> >> I just pulled the cdrom and put in my second IDE drive
> >> in its place and it works fine on /dev/hdc.
> >>
> >> For a proper RAID1 mirror, it is best to have the 2 drives
> >> on different controllers.  If they are both on the same
> >> controller, and that controller dies, you can't boot.
> >>
> >> I have no idea what the controllers are like on a
> >> Thinkpad motherboard and assume there is no /dev/hdd.
> >>
> >> Are hda, hdb, and hdc all on the same controller?
> >
> > You can check you dmesg for this information.  look for ide0 and
> > ide1. Here is the information on my T23.  Notice that hda and hdc
> > are on different controllers (ide0 and ide1).
> >
> > ICH3M: not 100% native mode: will probe irqs later
> >     ide0: BM-DMA at 0x1860-0x1867, BIOS settings: hda:DMA, hdb:pio
> >     ide1: BM-DMA at 0x1868-0x186f, BIOS settings: hdc:DMA, hdd:pio
>
> Are you sure they're on different controllers? I think that just
> means they are on different channels. Two channels on the same
> controller.

You are correct.  They are different channels.  But I assume that is=20
what the OP was talking about in the first place.  For better=20
performance of Raid you would want to use different ide channels.  They=20
is only one controller on the laptop.

Reed

=2D-=20
Reed Gregory
reed@progoth.com

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