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Two failed disks at same time
Hi all, Last monday this NAS in a client reported at the exact same time the failure of two of the three drives - thus loosing the volume No prior warnings existed and this beeing a backup NAS the ...
I Rebuilt the RAID5
Took the exepcted time. No errors whatsoever
Of course i dont trust this device anymore - it can be the disks but two failures at at the same instant with no smart errors and no errors on the test and on the rebuild points to some glitch on the NAS itself...
As it is 6+ years old I bought a new NAS for main backup and this will be secondary while it works
Thanks all
Your second failed disk has probably a minor problem, maybe a block failure. This is the cause, why the bad sync tool of your bad raid5 firmware crashed on it.
You could easily make a sector-level copy with a lowlevel disk cloning tool (for example, gddrescue is probably very useful), or sometime health status and use this disk as your new disk3. In this case, your array survived with a minor data corruption.
I am sorry, probably it is too late, because the essence of the orthodox answer in this case: "multiple failure in a raid5, here is the apocalypse!"
If you want very good, redundant raid, use software raid in linux. For example, its raid superblock data layout is public and documented... I am really sorry, for my this another heretic opinion.
EthelDStill wrote:
If you want very good, redundant raid, use software raid in linux.
Which is exactly what the ReadyNAS uses.
Disk cloning could be needed, but I don't think we know enough yet. If the array is out-of-sync, then cloning wouldn't be enough (and might not be needed at all).
I Rebuilt the RAID5
Took the exepcted time. No errors whatsoever
Of course i dont trust this device anymore - it can be the disks but two failures at at the same instant with no smart errors and no errors on the test and on the rebuild points to some glitch on the NAS itself...
As it is 6+ years old I bought a new NAS for main backup and this will be secondary while it works
Thanks all
It could be as simple as a power droop. Replacements are pretty cheap and might be worth the investment.
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