On 03/03/17 21:25, Gandalf Corvotempesta wrote:
Hi to all
Wouldn't be possible to add a sort of bitrot detection on mdadm?
I know that MD is working on blocks and not files, but checksumming a
block should still be possible.
In example, if you read some blocks with dd, you can still hash the
content and verify that on next read/consistency check
Isn't that what raid 5 does?
Actually, iirc, it doesn't read every stripe and check parity on a read,
because it would clobber performance. But I guess you could have a
switch to turn it on. It's unlikely to achieve anything.
Barring bugs in the firmware, it's pretty near 100% that a drive will
either return what was written, or return a read error. Drives don't
return dud data, they have quite a lot of error correction built in.
Cheers,
Wol
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