On Sun, 24 May 2015, Wols Lists wrote:

And if you get read errors, well, aiui, raid won't help here either - 
especially with mirrored raid, you just get a read failure. Raid does 
NOT give you error recovery unless the drive physically fails, and if 
it's a bad block it gets fixed at the disk or disk driver level - well 
below the raid driver.

You're wrong. In case of a read error from the physical drive on RAID1, 
RAID5 or RAID6 then the information will be re-created from another drive, 
and written to the drive that threw a read error. This is the whole point 
of RAID with parity information.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se