Checking consistency of Linux software RAID

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Hi,

Administrationg quite a few systems with HW raid controllers, I've come to
really like a feature that seems to be missing from current SW raid: 

Scheduling a (weekly) complete media scan where all surfaces of all drives
get read; in case of read errors a repair is tried: the content for the
failed sector is reconstructed just as if the drive had completely failed and
rewritten to the failed sector; if reading works afterwards, regard the
repair as successfull and continue using the drive.

Is there any way to do this with SW raid? I truly hate situations where some
sectors on a drive fail silently and you don't notice until a 2nd drive dies
and you find you can't recostruct your raid data becaus of silent "bitrot".

Tnaks for any hints,

Martin
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