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Data Volume lost after disk replacement on Readynas Pro 6
Hi, I just ran into a serious problem, and I hope someone can help me. Currently my Readynas Pro 6 does not see any volume on the 6 disk X-Raid Array anymore. I walked past my NAS a couple of...
Yes, required for other than windows filesystems.
Obviously much cheaper than any professional recovery service.
Ouch. Normally I'd suggest contacting Netgear support - but of course OS 6 is not supported on the Pro. Still they might be willing to take a data recovery contract (not sure).
Multiple disk failures do happen, and rebuilding the array when you replace a disk stresses all the others.
BTW (for future reference) it is a very bad idea to run a scrub on a compromised volume.
Thanks StephenB,
If I understand X-Raid2 well enough (since yesterday..) than it is essentially a raid 5 configuration. With my limited knowledge I would say that as only one disk failed at any moment it should be possible to recover if I have not damaged anything seriously with the scrubbing. Unfortunately I have no idea where to start and obviously I am done experimenting at this stage.
I'll be happy to contact Netgear to see if they can help me, but I'll be just as happy if anyone from the community is able to show me what needs to be done. I hope it can be fixed.
Although you received notification of the second disk failure after being notified that the resync had completed, it is possible that the disk actually failed during the resync. I've certainly seen many users experience this pattern of events.
If you have no backup then you should try support as StephenB has suggested. There isn't anything you can do which isn't going to make data recovery more difficult.
If support won't help then I guess you can look for other data recovery services.
Thanks vandermerwe,
I'll contact Netgear, I truly hope they can help me out
Your message made me think however: Since my problem I have been thinking to setup a second 6 bay system as hot standbye or as a live backup system.
But if it is common that two disks fail at the same time, and resync is often not succesfull, and if the chances for a simple recovery with a raid5 solution are slim therefore, wouldn't it be much safer to buy a simple dual disk NAS system and set it up only to mirror the other disk? In that case the chance for losing all data would be the chance that two disks out of two fail at the same time. In my 6 bay X-raid/Raid5 configuration the chances that two disks fail at the same time is 15 times higher (if my chance calc is right). I had never thought about it, but to me that sounds too risky (now). Maybe it doesn't justify the capacity loss of a simple mirrored setup with only two disks or the additional investment in more expensive 6 bay systems. But moreover, doesn't the much increased risk of data loss put X-Raid aside as a reliable solution for data storage?
With higher numbers of disks Xraid with dual redundancy (or RAID 6) is what most here would recommend.
A lot of us have a dual nas setup, using replicate or other synchronisation
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