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Tutor

Jul 24, 2015

Data Volume Lost after Disk Replace #25483643

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 error...

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mdgm-ntgr

NETGEAR Employee Retired

Jul 25, 2015

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.

azerva

Tutor

Jul 25, 2015

mdgm wrote:
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.

Hi,

thanks for your reply. I am also pretty sure that this is what happened. However, and I'd really like to come back to this, unlike disk 3 which failed completly, disk 4 is still accessible (hooked up to my PC right now) and I would like some advice or opinions about what I could at least try before giving up on the data. I have the Seagate Tools installed (since its a Seagate Disk), a SHORT DST Test failed. The tool recommends to use the DOS version to try and repair the bad sectors.

Should I give this a go or does anyone have any better ideas?

Thanks

Alex

vandermerwe
Master
Jul 25, 2015
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.
JennC
NETGEAR Employee Retired
Jul 25, 2015
Hello azerva,

I replied to your PM. Like what mdgm and vandermerwe advised you to do, contact support and leave this to the experts.

The data you have in that disk 4 cannot be retrieved without the other 2 original disks. Put the disk back to the NAS bay where you removed it and have the system logs ready as you will have to give that to the support center.

You may need to prepare a spare disk to clone disk 4. But let support check first if it is still possible before getting one (if you do not a have spare disk and will have to buy).

here's what mdgm replied yesterday to this topic.

Those ATA errors, reallocated sectors, current pending sectors and uncorrectable sector counts considered together indicate very clearly that this disk is bad. An attempt to clone this disk e.g. using dd_rescue may be necessary. This looks like a data recovery situation. You may need to consider purchasing data recovery services. Support could explain the cost and the scope of what is covered.

Regards,