Hi Manca.
What does the partition table on one of the drives look like? I don't quite
know what you mean by "I am imaging the Apple HFS part of the healthy drive in
the RAID". I am assuming that this array is striped and not mirrored, which
means that you would need both drives to use the array (you need to assemble
the array into one block device and then mount the filesystem on it).
If you are able to image both drives, then everything should work out. Image
them however you want - to separate drives or as two big files on one big
drive. Assuming the array is not corrupt, you will be able to mount the
filesystem on no matter where the image is. If you have another drive and make
a perfect image of the original disk and plug it into the enclosure, it will
probably work. If not, you can always assign the partitions on the images to
loop devices and then use mdadm to assemble the array using the loop devices
(on Linux - don't know about OS X.)
Cheers!
Andrew Zajac
________________________________
From: Manca Weeks <[email protected]>
To: [email protected]
Sent: Monday, October 5, 2009 9:52:01 PM
Subject: [Bug-ddrescue] Advice on rescuing LaCie Big Disk (this is not a bug
report nor contribution, respond only if willing)
Hi,
first and foremost - THANK YOU - for creating ddrescue. Me and many of my
customers are eternally indebted to you.
Let me know if there is a way for us to donate funds to the project.
I have a LaCie Big Disk with one drive working (I believe the RAID scheme is
striped and hardware based). I will try to swap the drive board (don't know the
proper handle -the chip that interfaces between the drive hardware and the ATA
interface) from the working drive to the non-working drive after I have made an
image of the one that works since the drives are identical.
It sounds (from my other drive rescuing experiences) like a drive with a power
issue, not a mechanical problem. So I hope switching the board will allow me to
grab the data from the other drive without too much trouble.
I have successfully recovered many drives using ddrescue before, but all were
on single drives, so the process was quite simple. I operate mainly in the GUI
of OS X so I am only familiar with basic unix concepts and commands.
I have another suitable healthy drive I may be able to use to attach to the
BigDIsk hardware in place of the damaged one, but I am uncertain about how to
properly duplicate the RAIDed data to the replacement drive. The model is only
slightly different and the manufacturing date is merely months apart, same
size. I would like to figure out a way to fool the RAID hardware to not notice
the drive swap.
Right now I am imaging the Apple HFS part of the healthy drive in the RAID, I
am uncertain where the RAID data is kept - I assume within the HFS partition,
but I realize I could be completely wrong.
If you are willing to help, please respond and I will provide whatever
additional details you need to help me figure this out.
If there is an existing thread, forum or any other resource detailing a case
like this, please direct me to it. This is a bit deeper than my usual web
searches, so I am not at home finding the information.
I am eternally grateful for ddrescue as is and will not be offended if you have
better things to do than help a newbie.
Thanks for your hard work.
Manca Weeks
http://overnightmac.com
888-308-9603
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