Ok now this takes the "Most egregiously creative misuse of ZFS" award :-)
I doubt ZFS can help if badblocks "didn't work". It would help to know what was
the problem with it, but generally a destructive test reveals a lot.
OTOH, you can also do better by writing a small program which writes random
data + its checksum (4K data fro /dev/urandom + md5) to the whole disk. A
second program can read the chunks back and report locations where the data
doesn't match the checksum.
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