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Forum Discussion
Image file of readynas duo drive
Hi, I have an old ReadyNas Duo that was setup as a RAID1. Unfortunately one of the drives is physically damaged, and the second drive developed bad blocks. A very bad scenario.
In any case I was able to create a 1.4TB image of the second drive using dd_rescue from a knoppix boot cd, but I don't exactly know how to recover files/folders from this image. I tried restoring the image to another drive:
dd_rescue imagefile.img /dev/sdb
And this completed "successfully", but when I inserted this drive into the readynas it just treated it like a new blank drive and installed new volumes on it.
Can someone give tips on how to go about recovering data from this image file. Any help is appreciated. Thanks in advance.
In any case I was able to create a 1.4TB image of the second drive using dd_rescue from a knoppix boot cd, but I don't exactly know how to recover files/folders from this image. I tried restoring the image to another drive:
dd_rescue imagefile.img /dev/sdb
And this completed "successfully", but when I inserted this drive into the readynas it just treated it like a new blank drive and installed new volumes on it.
Can someone give tips on how to go about recovering data from this image file. Any help is appreciated. Thanks in advance.
18 Replies
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- Try e.g.
# dd if=imagefile.img of=/dev/sdb - wouldn't this give the same results as the dd_rescue imagefile.img /dev/sdb command?
- By the second disk do you mean the disk at the right? Dd you put the clone in the same slot as the disk it was the clone of and remove all other disks before attempting to boot the NAS?
Were you using X-RAID or Flex-RAID RAID-1? mdgm wrote: By the second disk do you mean the disk at the right? Dd you put the clone in the same slot as the disk it was the clone of and remove all other disks before attempting to boot the NAS?
Were you using X-RAID or Flex-RAID RAID-1?
Yes the disk at the right, and yes I put the cloned disk in the same slot and all other disks were removed. Unfortunately, I honestly don't remember which Raid version I used :-(. I do know the cloned disk had some bad blocks I have received a few messages about this during the cloning process. But these were very few with regards to the size of the disk.- Did you do another clone with the -r option after you got the errors?
- What size disk was it? 1.5TB I hope. If its a 2TB and you only got 1.4TB off it, probably missing too much. X-RAID has signatures at the end of the disk also.
- This was my clone line:
dd_rescue -b 2M -A -v -l /var/dd_rescue.log /dev/hd{old} /dev/hd{new}
I haven't tried with -r, but I will next time. Also it was a 1.5T drive, so my assumption was that getting a 1.4T image should recover something useful. The bad blocks it found where at the beginning of the process. When I put the damaged drive in the duo I can see it trying to boot with the correct parameters: name and ip address, then it says running file system check, then it says bad disk. I don't even get this with the cloned disk, instead the device is treats it like a blank drive and begins the installation. - Lastly, I just wanted to say the drive I'm cloning to is a 2TB drive. Not sure if this makes a difference or not, but I wanted to point it out.
- What firmware is running in the duo?
- 4.1.8
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