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Volume: Bit Rot heeft een fout gedetecteerd in /data/Klanten/..../... en kan de fout niet verhelpen
Hello I have a ready nas 102 that produced errors some weeks ago: " Toename geconstateerd van aantal ATA-fouten: [708] op schijf 1 (Internal) [TOSHIBA DT01ACA100, 43R5ULENS] 12 maal in de afgelopen...
Adding a second disk won't resolve the ATA errors on the first disk. I recommend replacing disk 1.
I suspect the bit-rot errors are a consequence of the ATA errors - that the ATA errors led to some file system corruption. If you made the backup after the bit-rot errors were reported, then I think the affected files weren't backed up. You should check the backup to see.
One option is to replace disk 1, do a factory reset, and restore what data you have from the backup.
Another is to contact paid Netgear support (my.netgear.com), and see if they can help with the bit-rot errors.
Perhaps first you should go to the volume settings wheel, and make sure checksums are turned off. Then go to the settings wheel for each share, and make sure bit rot protection is turned off. That might allow you to access the files that have the bit-rot problem. They could still be corrupted though (that depends on whether the error is in the checksum or the file itself).
Thank you for your reply.
What I did is:
- I took a backup (weekly/daily)
- I added a new disk. So there was an old one and a new one. Made sure it was replicated (Raid1)
- I removed the old one and replaced it also with a new one. Made sure it was replicated (Raid1)
Everything looked ok.
Now I have the Bit Rot problem. Strange is that I have it only for files created or changed the last year. (Or maybe it is checked by date, going back).
Currently I am restoring my last backup (That one of yesterday evening). I just kopie the files manually back (overwrite) and it looks like the system accepts the files. (We can open the files again).
I will restore all affected directories and try like that. If some files are lost, it is not really a problem. If that does not work, I will buy another NAS and restore. Something I had to do before. The NAS is heavily used (growing company) and is working fine now for more than 2 years. It is "to-be-replaced". (Also because I have performance issues). Might go to an online solution (the cloud in). The reason why I have the NAS is because I run (already for 9 years) an MS Access database on it (10 simultanous users). I made the DB 9 years ago, thinking it will be good for 1 year, and it is still running and working like I want it. So I might go to a more <server>-based architecture and use the cloud for file storage only (lots of pictures, plans, pdf-documents). Building company.
I am only scared that some process or program is creating the Bit Rot problem. If this is not the case, it is solvable.
Thanks again for the reply.
I will do an update of this topic if the problem is solved (or if not).
Regards
I still have a question: Is there a possibility to check data-integrity or errors? Some tool or option I can use?
Thanks
If you are using RAID with redundancy, you can to a scrub, which has some level of checking.
I don't know an option to verify the BTRFS checksums - that would be useful thing to add to the maintenance tests. Perhaps suggest that in the Idea Exchange in the forum.
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