On Wed, Dec 3, 2008 at 4:26 PM, David Lethe <david@xxxxxxxxxxxx> wrote: >> -----Original Message----- >> From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- >> owner@xxxxxxxxxxxxxxx] On Behalf Of Paul Schriever >> Sent: Wednesday, December 03, 2008 2:52 PM >> To: linux-raid >> Subject: raid5 failed logical and physically; how to reconstruct? >> >> Hi all, >> >> having used mdadm and linux for slightly over a year now to great >> pleasure I came to face a problem. My raid5 got degraded due to hard >> disc failure. After this some form of logical damage also occurred. >> >> Everytime I wish to mount md0 I get an error from the system telling >> it's unable to mount, something wrong with the superblock. >> >> I tried to rebuild the array, without formatting the discs, and using >> a windows based tool I can still see that data is available, but >> garbled. >> >> Is there any way of recovering the array, and to recover my data? I am >> not a big linux guru and any tutorial / steps to take would be very >> much appreciated! >> >> yours >> >> Paul >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-raid" >> in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > Well, there are ways to recover it, but it comes down to how much damage > you started out with; what damage (if any), the windows-based tool > might have done; whether or not you have unreadable blocks on surviving > disks. If you just force a rebuild onto the new disk drive, then you > will absolutely make it worse. > > If data loss could be in the thousands of dollars range, then I wouldn't > use a cookbook recovery. Somebody who knows what they are doing and who > is directly involved will get more of your data back, and can look at > the raw blocks to see what is going on. They may also look at the disk > that "failed" and perhaps get data from that disk. > > I would immediately make raw copies of each physical device before going > further. Hopefully you can pick up a cheap 1TB SATA disk and dd > everything onto it. Not only can you play with a copy of the data, but > since you just lost a disk drive, then odds are high that another disk > in the RAID set will die. Just one more drive failure and you have > 100% data loss. > > David Assuming the gurus here can't help you -- If you put the above dd images onto a NTFS based partition, then you can buy Raid Reconstructor from RunTime Software for about $100 and try to rebuild your via it. There is a free trial that you can test with I believe. I've forgotten if you can actually attempt a rebuild via the trial product. It runs in Windows thus the need for NTFS to hold the dd images of the physical drives. Good Luck Greg -- Greg Freemyer Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
