Re: RAID-1, identical disks recognised differently

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On Sun, 10 Feb 2002, Mikael Johansson wrote:

> > You can use the 'hdX=cylinders,heads,sectors' kernel parameter to make the
> > kernel see the second drive the way you want it to see (I use this a
> > lot) ie. identical to the first one.
>
> Hmm, it does sound a bit unsafe, one boot (from a CD, say) with the wrong
> parameters and everything's screwed, right?

It shouldn't be, really. I had a couple of situations where I forgot the
'hdc=' parameter and it all worked well.

> > lots of identical drives gets different number of chs  for
> > hda vs hdb  on different motherboards  but is usally identical between hda
> > and hdc and same between hdb and hdd
> >
> > so if you have a 2-drive raid1 .. just use hda and hdc as the
> > preferred configuration ..
>
> My disks are located on hda and hdc, so the above seems not to apply in my
> case. There is a difference on the buses though, I have a CD-drive on hdd,
> while hdb is empty. Maybe that could explain why the identification goes
> bad?

I've never seen a situation Alvin describes. Your situation seems to be
'normal' though. I've had this on EVERY motherboard I used with SW RAID so
far.

Having RAID on hda & hdb is NOT a good idea anyway (plain linear might be
an exception).

   D.


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