When a block of data on a mirrored disk goes bad, mdadm won't be able to fix it and often doesn't even know that the data is bad.
Since there is a mirrored copy this a correct copy of your data but since there is no metadata or checksums, mdadm has no way to tell which is correct.
ZFS will silently detect the corruption and will rewrite the data restoring the duplicate copy of the data again.
All this works great without ECC RAM, recent studies of data corruption have shown that RAM is much more reliable then previously thought. ECCisnt needed for ZFS for home use.
Since there is a mirrored copy this a correct copy of your data but since there is no metadata or checksums, mdadm has no way to tell which is correct.
ZFS will silently detect the corruption and will rewrite the data restoring the duplicate copy of the data again.
All this works great without ECC RAM, recent studies of data corruption have shown that RAM is much more reliable then previously thought. ECCisnt needed for ZFS for home use.