raid 0 problems

[Nathan England]

He's right. If the drive is physically dead, there is nothing you can do. If 
it is still spinning, there are some programs that you could copy it to 
another drive, in the case it has bad sectors or something. 

If your friends info is important enough, Data Doctors can fix this, but it 
will start at about 1500 bucks!



On Sunday 26 March 2006 20:54, Craig White wrote:
> On Sun, 2006-03-26 at 20:40 -0700, Technomage wrote:
> > On Sunday 26 March 2006 20:18, Nathan England wrote:
> > > The problem with raid 0, while giving expanded filesystems over many
> > > disks is there is no fault tolerance, so it is possible that when one
> > > of those drives took a dump, you lost ALL of that data. I could be
> > > wrong, but I'm pretty sure that is how it works.
> > > Does the drive power up at all?
> >
> > yes
> >
> > > Or is it completely dead?
> > > What is the file system on it? Can you boot with a knoppix disc and try
> > > to let it e2fsck or reiserfsck that filesystem and see if it fixes it?
> >
> > fs = XFS
> >
> > problem is: the drive is not mountable (given previously stated errors)
> > even in a live or rescue configuration.
> >
> > now, I am running a test of this given that a friend of mine has this
> > identical problem, only he has FORENSIC DATA stored on there and he
> > ABSOLUTELY NEEDS TO RECOVER IT and thus, he is unwilling to try these
> > tests on his disks due to lack of hardware backups (more disks).
> >
> > this means, I need some way of recovering the data from the first of 2
> > discs given that the second one in the raid 0 configuration is either
> > failed (hardware) or otherwise not usable.
> >
> > > On Sunday 26 March 2006 20:13, Technomage wrote:
> > > > I need the help of a raid "expert"
> > > >
> > > > I have a raid 0 problem. seems that when a machine went belly up on
> > > > me, it damages part of a raid 0 virtual fs in such a way that I can
> > > > no longer mount the 2nd 9and smaller) half of the filesystem.
> > > >
> > > > the kernel panics on boot and I get all kinds of "bad magic" errors
> > > > when attempting to do so.
> > > >
> > > > I have more than enough HD space to copy the images, but I need to
> > > > get the data off this "raid 0 fs" as soon as possible.
> > > >
> > > > can anyone help?
>
> -------
> xfs has specific recovery tools and the normal fsck tools will simply
> destroy data. Probably a good idea to get cozy with the version of XFS
> that you are running and the file system repair tools suitable for that
> version. Perhaps you want to locate a suitable forum/mail list at SGI
> for this.
>
> this link pretty much tells the story about RAID 0
>
> http://www.pcguide.com/ref/hdd/perf/raid/levels/singleLevel0-c.html
>
> from which I quote..."Special Considerations: Using a RAID 0 array
> without backing up any changes made to its data at least daily is a loud
> statement that that data is not important to you."
>
> If you have to ask this list to suggest ways how this might be
> accomplished, you are wasting your time.
>
> If you actually can recover data from a RAID 0 array with a dead member,
> you can probably make a fortune.
>
> Craig
>
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