Hello ReadyNAS Community, after a disk failure (disk 3), I replaced this disk. A volume resynchronization was started automatically. However, this resynchronisation failed with no obvious errors and now the entire data volume is unavailable. Can anyone please provide any help as to how to try to rebuid this volume or make it available again? Regards Alex

The problem with the disk caused the resync to fail. In the status log and elsewhere I see a number of mentions of errors dating back some months. Before replacing a disk that has failed it is advisable to check to see if any other disks have problems as well as consider where you are regarding backups. For new disk purchases I would go with e.g. WD RED disks or SeaGate NAS disks.

No.Wait for Netgear support to see if data recovery is an option. If they haven't offered it, ask them. If you start altering the data on the disks then it is likely you will make data recovery more difficult. It is possible that cloning disks and trying to reassemble the raid structure may be what is needed, but leave this to someone with expertise, and be prepared to pay for it.

Hello azerva, Do you still have access to the admin page of the NAS? Please attach system logs here if you do. Please let us know the model of the NAS you have and how many disks are inserted. Regards,

I don't suppose you have a backup of the data on the volume?

Hi, I still have access via HTTP GUI and SSH. I don't know how good the logs will be, but I will provide then nonetheless. I'm not sure how tho, can't seem to find an attachment button around here.

Data Volume Lost after Disk Replace #25483643

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JennC
NETGEAR Employee Retired
Jul 24, 2015
Hello azerva,

Do you still have access to the admin page of the NAS? Please attach system logs here if you do. Please let us know the model of the NAS you have and how many disks are inserted.

Regards,
- azerva
  Tutor
  Jul 24, 2015
  Hi,
  
  I still have access via HTTP GUI and SSH. I don't know how good the logs will be, but I will provide then nonetheless. I'm not sure how tho, can't seem to find an attachment button around here.
vandermerwe
Master
Jul 24, 2015
I don't suppose you have a backup of the data on the volume?
- azerva
  Tutor
  Jul 24, 2015
  vandermerwe wrote:
  I don't suppose you have a backup of the data on the volume?
  Hi,
  
  well no. It's quite a lot of data, was around 5 TB (I had 4 x 2 TB drives), so not actually a lot of space to back it up twice. The NAS was supposed to be the "redundant" backup ;)
  
  So I'm open to any suggestions.
  - vandermerwe
    Master
    Jul 24, 2015
    Sending logs is described here, you just download them from the nas then email them in:
    
    http://kb.netgear.com/app/answers/detail/a_id/21543
    
    There are many scenarios that a redundant volume does not offer protection against, therefore backups are essential.
    
    What model readynas is it?
    
    I think you need to ask Netgear support to look to look at this, open a support case and be prepared to pay.
azerva
Tutor
Jul 29, 2015
Hi guys,

update on the whole situation. Netgear Support recommended cloning the disk with ddrescue. I did this, the process finished with 4 errors. Below is the log file.

# Command line: ddrescue -fv /dev/sdb /dev/sda ddrescue.log # current_pos current_status 0x14419EC7C00 + # pos size status 0x00000000 0x139A33C4000 + 0x139A33C4000 0x00001000 - 0x139A33C5000 0x00004000 + 0x139A33C9000 0x00001000 - 0x139A33CA000 0xA76AF6000 + 0x14419EC0000 0x00001000 - 0x14419EC1000 0x00005000 + 0x14419EC6000 0x00002000 - 0x14419EC8000 0x8DA724E000 +
If I am reading this correctly, there are 4 relatively small areas (designated by the - at the end which are bad). I tried to start ReadyNAS with disks 1, 2 and the cloned disk 4, however this didn't work.

Are there any additional steps I need to consider? Should I consider re-running ddrescue using the -r option for more retries? Or is there a command to try to re-detect the RAID volume?

Thanks for any hints.

Alex
- vandermerwe
  Master
  Jul 29, 2015
  Are support not following up on this case?
  Did they offer you data recovery services?
- JennC
  NETGEAR Employee Retired
  Jul 30, 2015
  Hello azerva,
  
  I strongly recommend not to touch anything but just follow thier instructions. I don't think booting up the NAS with the remaining disks along with the cloned one will rebuild the RAID and get you access the data right away, there are still few steps they will have to do once you have the disk cloned. Please contact the support center to continue with it.
  
  Regards,

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Data Volume Lost after Disk Replace #25483643

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