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Forum Discussion
How does bitrot protection actually work?
I understand the concept, but am curious how it is actually implemented on 6.2.0
Well, I am very skeptical that the bad non-ecc memory would magically fail systematically on the checksum and nothing else.
Having said that, I believe Netgear's implementation repairs bitrot using the RAID protection. So if the checksum fails to validate, it attempts to rebuild the sector that failed from the other RAID blocks in that stripe. If that doesn't result in a checksum that passes, then the bitrot repair fails. That sounds similar to the way you describe ZFS.
Of course, once either approach finds something good to use, that pesky bad memory might just corrupt it before it gets rewritten. So I am sticking with my position that bad memory can corrupt any file system. It seems to me that the simplest way to corrupt the volume with bad memory is on the initial write (the data being corrupted in memory before it is ever written to the disk).
If you are concerned about the impact of non-ecc memory, then perhaps buy a readynas that has ecc (e.g., the RN516)
Having said that, I believe Netgear's implementation repairs bitrot using the RAID protection. So if the checksum fails to validate, it attempts to rebuild the sector that failed from the other RAID blocks in that stripe. If that doesn't result in a checksum that passes, then the bitrot repair fails. That sounds similar to the way you describe ZFS.
Of course, once either approach finds something good to use, that pesky bad memory might just corrupt it before it gets rewritten. So I am sticking with my position that bad memory can corrupt any file system. It seems to me that the simplest way to corrupt the volume with bad memory is on the initial write (the data being corrupted in memory before it is ever written to the disk).
If you are concerned about the impact of non-ecc memory, then perhaps buy a readynas that has ecc (e.g., the RN516)
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