Re: Re-map disk sectors in userspace when rewriting after read errors

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On Tue, 15 Sep 2009, Matthias Urlichs wrote:

my problem is that I have a bunch of crappy disks which seem unable to
reliably remap bad areas after a read error.

IME, discs don't remap after read errors, only on writes.

This obviously makes the read error rewrite feature of our beloved
RAID5/6 code somewhat less than useful.

Are you sure that refresh-writes triggered by read errors are expected
behaviour of md's RAID5/6 mode? Only they weren't for RAID1 until somewhat
recently (2.6.15, IIRC).

Best Regards,
Alex
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