Re:HFS+ Bit Rot
by rodgerd on Wednesday June 11, 2014 @03:11AM
(#7876787)
ZFS isn't particularly consumer-friendly, either. Explaining why you can't delete files from a 100% full filesystem, or the pain and complexity of trying to move from 512 byte to 4096 byte sectors and so on would be a nightmare. And of course the design assumes high-quality hardware (ECC RAM for example).
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The design doesn't assume ECC RAM. It's recommended because you can't talk about end-to-end checksumming and then not explain that it can't proof you against unreliable memory.
All other filesystems are equally susceptible - if your memory is getting errors, they'll happily write those to disk too.
Actually, XFS checksumming will alert on errors caused by bad RAM.
Depends what you mean by this. ZFS will alert if it reads data into ram that then doesn't match the checksum during verification.
But it can't prevent a bitflip of data in memory from getting written to disk before the checksum is calculated. Nor can it prevent data being bitflipped after its been verified and handed off to the application.
Which I'm pretty sure XFS can't do either.