raid 0 problems

[Shawn Badger]

I have found that with certain controller board problems that sticking
the drive int the freezer for a couple hours will bring it back to life
long enough to at least recover the data. It is a cheap and not nearly
as extreme as swapping platters or the controller boards.


On Sun, 2006-03-26 at 22:11 -0700, Technomage wrote:
> On Sunday 26 March 2006 21:45, Alan Dayley wrote:
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> > Technomage wrote:
> > > since I *know* this can be done, there has to be a way for someone in my
> > > position to be able to do this without expending THOUSANDS of DOLLARS (in
> > > money I don't even have) to do this.
> >
> > One trick I have been successful doing is to find a working hard drive
> > of the same model.  Then, assuming the platters and motors are good, you
> > can replace the logic board on one drive with the logic board on the
> > good drive.  Do this very carefully or you will end up with two dead
> > drives!  But, if the logic board "contains" the problem, this can get
> > the drive up and running again.  The description of the actual drive
> > failure seems to point to a logic board problem so this may work for you.
> 
> I concur. We are, however, without a proper sized torx bit to accomplish this 
> (will wait and head off to the hardware store tomorrow to find one)
> 
> >
> > RAID 0 with two drives means half the data is on one and half on the
> > other.  The RAID logic will put, for example, 4 blocks on one and then 4
> > blocks on the other and so on.  That means every 4th (or whatever number
> > it was using) block is on the dead drive.  That is hard to recover from
> > because the data doesn't make sense with only one of the drives.  There
> > are other issues and possible complications but you probably are
> > studying up on all of that.
> 
> the above is true in HARDWARE RAD-0. However, given that this was a linux 
> (suse 10+) software raid-0, it appears (and was proven by direct observation) 
> that the data was written in serial fashion from 1 drive and spanning to the 
> second. 
> 
> >
> > This is why it costs so much to recover.  It's not easy and take
> > experience to do efficiently.  I hope you can get the dead drive up
> > since that would be the easiest way to recover.
> 
> understandable.
> 
> we are exploring all available options though (and I have contacted the 
> developer though have not yet received a reply).
> 
> 
> >
> > Good Luck!
> 
> thank you!
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