RAID Munging Question

[cdoerbec at cso.fmr.com (Christoph Doerbeck A242369)]

I'm experimenting with this whole mess as I right this.  Well,
not literally right now, but when I'm at home...

With SCSI it's very easy... and I have already experimented with
hot removing and adding disks to the system.  That works...
(I have a SCA2 hotswap drive bay in my system :-))))

But IDE is a whole different beast.  Once I finish getting my root
disk configured into a RAID1, I'll get around to playing with my IDE
setup.  Setting up / & /boot into RAID1 is easy during installation.
I still haven't figure out how to do it post installation.  The
HOWTO/README is a bit dated :-(


Kent Borg wrote:
> On Fri, Apr 05, 2002 at 10:24:11PM -0500, christoph at linuxsoup.com wrote:
> > Gordon & I simulated a disk failure on a raid1 setup at the
> > last BLU meeting.  The system DID hang.  Perhaps there's a lengthy i/o
> > timeout which would eventually allow the system to keep running,
> > OR perhaps there are certain IDE features (DMA?) one could turn off to
> > improve the recovery. But "hang" it did!
> 
> Hmmm, interesting.  
> 
> I was considering experimenting with that myself, but couldn't decide
> how to do the experiment.  Just pull the power perhaps?  I figured
> that would do it, but I was unsure how to put that disk back in the
> array.  If one just plugs it back in, is the system smart enough to
> know which disk should win and update the other one?  
> 
> How did you do it?  Makes me wish I had more hardware sitting around
> so I could do more experiments without disrupting stuff I care about.
> 
> 
> -kb, the Kent who had a busy weekend and so didn't have the chance to
> do his 0->1 conversion.
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