Re: feature suggestion to handle read errors during re-sync of raid5

[Goswin von Brederlow <goswin-v-b@web.de>]

Asdo <asdo@shiftmail.org> writes:

> John Robinson wrote:
>> On 30/01/2010 21:33, Mikael Abrahamsson wrote:
>> [...]
>>> I think the 4k sector size on WD20EARS (for instance) is supposed
>>> to add more ECC information but I'm not sure how this will affect
>>> the 10^14 error rate.
>>
>> iirc part of the point of moving to 4K sectors is to improve the
>> error correction to something like 1 in 10^20 or 22 without losing
>> storage density, partly by using what was lost before in
>> inter-sector gaps and partly because you can do better with more
>> bits of ECC over more data.
> I remember the other way around: the purpose of 4k was to keep the
> same error rate while saving storage space

I thought the purpose of 4k was to reduce the number of blocks so the
wear leveling has to handle less data.

MfG
        Goswin