[CentOS] Problem with dual-booting soft-RAID

[Johnny Hughes]

On Sat, 2006-06-10 at 19:31 +0200, Kai Schaetzl wrote:
> Les Mikesell wrote on Fri, 09 Jun 2006 14:00:54 -0500:
> 
> > If you followed the HOWTO you may have accounted for the different drive 
> > in the grub setup.
> 
> I don't know what you mean. I followed the howto and everything works. The 
> point is: in my opinion it should *not* work. No matter which drive I 
> remove it always boots successfully from the default 0 label, although that 
> is on hd0 which is gone if I remove that drive. Theoretically, it should 
> fail to boot from hd0 and fallback to hd1. This is IDE, not SCSI.
> 
> (I can also boot fine from hd1 if I interrupt the automatic boot, so grub 
> is setup correctly.)
> 
> Kai
> 

Kai,

One thing that I think you may be missing is this ...

In grub ... hd0 is the first found hard drive ... hd1 is the second
found hard drive, etc.

IF ... you remove the primary hard drive (ie power it off, and unplug
the cable) ... then the drive that is left (that used to be hd1) is now
hd0

So ... when booting, it will be seen as hd0 and you won't have an hd1.

Well ... at least that is what I have experienced in the past ... maybe
someone else who is smarter than me would care to comment / verify this
behavior.

Thanks,
Johnny Hughes
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