Re: the " 'official' point of view" expressed by kernelnewbies.org regarding reiser4 inclusion

Hans Reiser
2006-08-03T18:27:06Z

Edward Shishkin wrote:

> Matthias Andree wrote:
>
>> On Tue, 01 Aug 2006, Hans Reiser wrote:
>>
>>
>>> You will want to try our compression plugin, it has an ecc for every
>>> 64k....
>>
>>
>>
>> What kind of forward error correction would that be,
>
>
>
> Actually we use checksums, not ECC. If checksum is wrong, then run
> fsck - it will remove the whole disk cluster, that represent 64K of
> data.

How about we switch to ecc, which would help with bit rot not sector loss?

>
>
> and how much and
>
>> what failure patterns can it correct? URL suffices.
>>
>
> Checksum is checked before unsafe decompression (when trying to
> decompress incorrect data can lead to fatal things). It can be
> broken because of many reasons. The main one is tree corruption
> (for example, when disk cluster became incomplete - ECC can not
> help here). Perhaps such checksumming is also useful for other
> things, I didnt classify the patterns..
>
> Edward.
>
>