ZFS scrub/selfheal not really working

[Andrew Snow]

Dmitry Marakasov wrote:
>>> So, my question is why doesn't ZFS rewrite those sectors with READ
>>> errors during scrub?
>> Because of the transactional nature of ZFS it writes the fresh data in a 
>> different part of the disk and then marks the old bad sectors as free.
> Ok, then why does read errors pop up again after scrub, while they
> should have been recovered?

Because your disk subsystem is broken and keeps returning new sets of 
bad sectors.

- Andrew