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Forum Discussion
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...
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.
vandermerwe wrote: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.
Thanks for this. I have sent the logs. I have already contacted Netgear, but as you probably know / assume they are not very eager to help. At the moment they are looking into the case. However, I assume that the Netgear implementation of RAID is based on existing technolgoies, and that there is maybe at least one or two rebuild or salvage commands I can try. I was hoping I could maybe find an answer here.
The model is RNS-104, was bought diskless, and has 4 drives in it.
Thanks in advance for your time,
Alex
Hi azerva,
I looked at some information on the logs you have sent and on my understanding, it appears that Drive 4 may have also failed. To confirm this, please download disk diagnostic tools from Western Digital (WD lifeguard) or Seagate's(Seatools) webiste and check your drives. My hopes are still high that your data will be recovered.
I'll look forward to your response.
Thanks,
Your logs show that disk 4 has been giving errors for quite some time.
It would have been good to have been asked before there was a big problem whether the errors were a cause of concern.
When you replace a failed disk, the resulting resync that puts heavy stress on all disks can finish off another disk that is failing.
ATA Error Count: 90 Reallocated Sectors: 696 Reallocation Events: 696 Spin Retry Count: 0 End-to-End Errors: 0 Command Timeouts: 0 Current Pending Sector Count: 48 Uncorrectable Sector Count: 48 Temperature: 47 Start/Stop Count: 1554 Power-On Hours: 14041 Power Cycle Count: 232 Load Cycle Count: 1555
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.
Hi mdgm,
thanks for your reply. I remember only getting one e-mail notification from the system regarding disk 4, somehow I was not aware that there were so many errors reported by the disk already, otherwise I would have mentioned it. Also, disk 4 is online now, that's what I find a little strange. When disk 3 failed a week ago, it was really offline, i.e. red and could not start. I even tried putting in a usb docking port and it didnt boot up. Disk 4 however "seems" to be fine now. This is why I still have some hope left that there is something I can do.
Fri Jul 24 2015 2:15:52 Disk: Disk in channel '4' (Internal) changed state from ONLINE to FAILED. Fri Jul 24 2015 2:15:49 Disk: Disk in channel '3' (Internal) changed state from RESYNC to ONLINE. Fri Jul 24 2015 2:15:46 Volume: The rebuild operation has finished on volume 'data'. However, the volume is still degraded.
By loooking at the timestamps of the events, it would seem that the resync finished just seconds (02:15:46) before disk 4 failed (02:15:52), but I guess this is a reporting error and the events probably happened the other way around, and the "failure" of disk 4 caused the resync to fail and it was just reported the other way around. What do you think, is this a correct assumption? Otherwise, If the resync did finish before disk 4 failed, then I would expect to be able to use the device like I did after disk 3 failed, i.e. volume in a degraded state with disk 4 offline.
All in all it seems that disks 3 and 4 were of poor quality, since both were bought at the same time and seem to have failed at almost the same time, even before warranty ran out.
JohnRo wrote:Hi azerva,
I looked at some information on the logs you have sent and on my understanding, it appears that Drive 4 may have also failed. To confirm this, please download disk diagnostic tools from Western Digital (WD lifeguard) or Seagate's(Seatools) webiste and check your drives. My hopes are still high that your data will be recovered.
I'll look forward to your response.
Thanks,
Hi JohnRo,
I connected disk 4 to my PC and I can see it using SeaTools. Which Check / Repair should I try to do?
Thanks in advance.
Alex
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